Fair Value Measurements (Level 3 Quantitative Information) (Details) - Level 3 - USD ($)
$ in Millions |
6 Months Ended |
12 Months Ended |
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Jun. 30, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Mar. 31, 2016 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2012 |
| Mortgage servicing rights | Weighted Average |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
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8.20%
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8.90%
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7.70%
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| Prepay rate (percent) |
16.40%
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12.60%
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15.00%
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11.90%
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| Recurring |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value assets with unobservable inputs |
$ 383
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$ 402
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$ 545
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$ 505
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$ 376
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$ 558
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$ 542
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$ 809
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| Fair value liabilities with unobservable inputs |
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(84)
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(166)
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(199)
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(120)
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(152)
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(19)
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| Recurring | Rate lock commitments |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value assets with unobservable inputs |
83
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26
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31
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10
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61
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30
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55
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86
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| Recurring | Consensus pricing | Rate lock commitments |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value assets with unobservable inputs |
$ 83
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$ 26
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| Recurring | Consensus pricing | Minimum | Rate lock commitments |
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| Fair Value Inputs [Abstract] |
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| Original pull-through rate |
65.50%
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67.60%
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| Recurring | Consensus pricing | Maximum | Rate lock commitments |
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| Fair Value Inputs [Abstract] |
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| Original pull-through rate |
98.30%
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101.50%
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| Recurring | Consensus pricing | Weighted Average | Rate lock commitments |
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| Fair Value Inputs [Abstract] |
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| Original pull-through rate |
81.90%
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84.60%
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| Recurring | Rate lock commitments | Consensus pricing |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value liabilities with unobservable inputs |
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$ 26
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$ 31
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| Recurring | Rate lock commitments | Consensus pricing | Minimum |
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| Fair Value Inputs [Abstract] |
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| Original pull-through rate |
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67.60%
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66.20%
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| Recurring | Rate lock commitments | Consensus pricing | Maximum |
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| Fair Value Inputs [Abstract] |
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| Original pull-through rate |
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101.50%
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99.30%
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| Recurring | Rate lock commitments | Consensus pricing | Weighted Average |
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| Fair Value Inputs [Abstract] |
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| Original pull-through rate |
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84.60%
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82.70%
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| Recurring | Long-term debt | Discounted cash flows |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value liabilities with unobservable inputs |
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$ (84)
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| Recurring | Long-term debt | Discounted cash flows | Minimum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
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6.40%
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| Prepay rate (percent) |
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16.00%
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| Weighted average life (in years) |
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6 months
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| Recurring | Long-term debt | Discounted cash flows | Maximum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
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9.60%
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| Prepay rate (percent) |
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24.00%
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| Weighted average life (in years) |
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8 months 12 days
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| Recurring | Long-term debt | Discounted cash flows | Weighted Average |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
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8.00%
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| Prepay rate (percent) |
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20.00%
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| Weighted average life (in years) |
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7 months 12 days
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| Recurring | DOJ litigation settlement |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value liabilities with unobservable inputs |
$ (84)
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$ (84)
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$ (82)
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(93)
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(84)
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(84)
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(82)
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(19)
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| Recurring | DOJ litigation settlement | Discounted cash flows |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value liabilities with unobservable inputs |
$ (84)
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$ (84)
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$ (82)
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
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7.20%
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8.70%
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| Recurring | DOJ litigation settlement | Discounted cash flows | Minimum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
5.60%
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4.90%
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6.40%
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| Recurring | DOJ litigation settlement | Discounted cash flows | Maximum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
8.30%
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9.50%
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11.00%
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| Recurring | DOJ litigation settlement | Discounted cash flows | Weighted Average |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
6.90%
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7.20%
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8.70%
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| Recurring | Second mortgage |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value assets with unobservable inputs |
$ 38
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$ 42
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$ 53
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65
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40
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48
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50
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0
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| Recurring | Second mortgage | Discounted cash flows |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value assets with unobservable inputs |
$ 38
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$ 42
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$ 53
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| Recurring | Second mortgage | Discounted cash flows | Minimum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
7.20%
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7.20%
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7.20%
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| Prepay rate (percent) |
10.90%
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13.50%
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11.30%
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| CDR rate (percent) |
2.70%
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2.60%
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2.40%
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| Recurring | Second mortgage | Discounted cash flows | Maximum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
10.80%
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10.80%
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10.80%
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| Prepay rate (percent) |
16.40%
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20.20%
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17.00%
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| CDR rate (percent) |
4.10%
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4.00%
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3.60%
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| Recurring | Second mortgage | Discounted cash flows | Weighted Average |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
9.00%
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9.00%
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9.00%
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| Prepay rate (percent) |
13.60%
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16.90%
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14.20%
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| CDR rate (percent) |
3.40%
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3.30%
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3.00%
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| Recurring | HELOC loans | Discounted cash flows |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value assets with unobservable inputs |
$ 44
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$ 64
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$ 132
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| Recurring | HELOC loans | Discounted cash flows | Minimum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
7.80%
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6.80%
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8.00%
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| Prepay rate (percent) |
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7.20%
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| CDR rate (percent) |
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6.60%
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| Loss severity rate (percent) |
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60.20%
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| Recurring | HELOC loans | Discounted cash flows | Maximum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
11.70%
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10.10%
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12.00%
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| Prepay rate (percent) |
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10.80%
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| CDR rate (percent) |
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9.90%
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| Loss severity rate (percent) |
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90.20%
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| Recurring | HELOC loans | Discounted cash flows | Weighted Average |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
9.70%
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8.40%
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10.00%
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| Prepay rate (percent) |
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9.00%
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| CDR rate (percent) |
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8.30%
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| Loss severity rate (percent) |
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75.20%
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| Recurring | Mortgage servicing rights |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value assets with unobservable inputs |
$ 301
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$ 296
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$ 258
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$ 285
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$ 281
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$ 317
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$ 279
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$ 711
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| Recurring | Mortgage servicing rights | Discounted cash flows |
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| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] [Line Items] |
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| Fair value assets with unobservable inputs |
$ 301
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$ 296
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$ 258
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| Recurring | Mortgage servicing rights | Discounted cash flows | Minimum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
6.70%
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6.60%
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7.10%
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| Prepay rate (percent) |
13.40%
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10.30%
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12.20%
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| Weighted average cost to service per loan |
$ 57
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$ 57
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$ 67
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| Recurring | Mortgage servicing rights | Discounted cash flows | Maximum |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
10.10%
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9.90%
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10.70%
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| Prepay rate (percent) |
19.30%
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14.80%
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17.10%
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| Weighted average cost to service per loan |
$ 85
|
$ 86
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$ 88
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| Recurring | Mortgage servicing rights | Discounted cash flows | Weighted Average |
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| Fair Value Inputs [Abstract] |
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| Discount rate (percent) |
8.40%
|
8.20%
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8.90%
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| Prepay rate (percent) |
16.40%
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12.60%
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15.00%
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| Weighted average cost to service per loan |
$ 71
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$ 72
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$ 78
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