Mortgage Servicing Rights (Income and Fees from Associated with Mortgage Servicing Asset and Mortgage Loan Subserviced) (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
12 Months Ended |
Jun. 30, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2013 |
Sep. 30, 2013 |
Jun. 30, 2013 |
Mar. 31, 2013 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Servicing Assets at Fair Value [Line Items] |
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| Gain related to the sale of MSRs |
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$ 2
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| Net (loss) return on the mortgage servicing assets |
$ (4)
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$ 9
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$ 12
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$ 9
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$ (2)
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$ 2
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$ 1
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$ 5
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$ 16
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$ 17
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$ 27
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$ 31
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$ 15
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$ (10)
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$ 7
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| Residential first mortgage |
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| Servicing Assets at Fair Value [Line Items] |
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| Total income on mortgage servicing asset, included in net return on mortgage servicing asset |
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28
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$ 24
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$ 91
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| Residential first mortgage loans subserviced for others |
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| Servicing Assets at Fair Value [Line Items] |
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| Total income on mortgage servicing asset, included in net return on mortgage servicing asset |
(4)
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9
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(10)
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7
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| Mortgage servicing rights |
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| Servicing Assets at Fair Value [Line Items] |
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| Net (loss) return on the mortgage servicing assets |
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2
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2
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| Net return on mortgage servicing asset | Residential first mortgage |
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| Servicing Assets at Fair Value [Line Items] |
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| Servicing fees, ancillary income and late fees |
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69
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69
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185
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| Fair value adjustments |
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(44)
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(69)
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(5)
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| Gain (loss) on MSR derivatives |
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5
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26
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(70)
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| Net transaction costs |
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(2)
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(2)
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(19)
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| Net return on mortgage servicing asset | Residential first mortgage loans subserviced for others |
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| Servicing Assets at Fair Value [Line Items] |
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| Servicing fees, ancillary income and late fees |
21
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17
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38
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34
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| Fair value adjustments |
(45)
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12
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(93)
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(14)
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| Gain (loss) on MSR derivatives |
19
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(14)
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45
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(5)
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| Net transaction costs |
1
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(6)
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0
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(8)
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| Loan Administration Income | Residential first mortgage loans subserviced for others |
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| Servicing Assets at Fair Value [Line Items] |
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| Servicing fees, ancillary income and late fees |
7
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9
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14
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16
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33
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28
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17
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| Other servicing charges |
(3)
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(2)
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(4)
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(5)
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(7)
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(4)
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(11)
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| Total income on mortgage loans subserviced, included in loan administration |
$ 4
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$ 7
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$ 10
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$ 11
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$ 26
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$ 24
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$ 6
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