Fair Value Measurements (Changes in Fair Value Included in Earnings) (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
12 Months Ended |
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Loans held-for-sale | Net gain on loan sales |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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|
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|
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| Changes in fair value, gain (loss) |
$ 145
|
$ 37
|
$ 289
|
$ 142
|
$ 321
|
$ 401
|
$ 201
|
| Loans held-for-sale | Other noninterest income |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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|
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| Changes in fair value, gain (loss) |
|
|
|
|
0
|
(2)
|
0
|
| Loans held-for-investment | Other noninterest income |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
|
|
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| Changes in fair value, gain (loss) |
0
|
(25)
|
0
|
(34)
|
40
|
44
|
29
|
| Loans held-for-investment | Interest Income |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
|
|
|
| Changes in fair value, gain (loss) |
2
|
4
|
2
|
7
|
|
|
|
| Long-term debt | Other noninterest income |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
|
|
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| Changes in fair value, gain (loss) |
0
|
(14)
|
0
|
(25)
|
29
|
22
|
5
|
| DOJ litigation settlement | Other noninterest expense |
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
|
|
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| Changes in fair value, gain (loss) |
|
|
|
|
$ (2)
|
$ 11
|
$ (74)
|
| DOJ litigation settlement | Other Expense |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
|
|
|
| Changes in fair value, gain (loss) |
$ 0
|
$ 3
|
$ 0
|
$ 2
|
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