Loans Held-for-Investment (Loans Held-for-sale Narrative) (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 |
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
|
| Transfer of loans held-for-sale to loans held-for-investment |
|
|
$ 0
|
$ 27
|
$ 30
|
$ 19
|
$ 64
|
| Reduction in allowance |
$ 10
|
$ 21
|
24
|
64
|
101
|
52
|
197
|
| Financing Receivable, Significant Sales |
|
15
|
|
51
|
|
|
|
| Gain (Loss) on Disposition of Other Assets |
0
|
(2)
|
(2)
|
(2)
|
(1)
|
12
|
2
|
| Loans held-for-investment |
|
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
|
| Loans pledged as collateral |
4,900
|
|
4,900
|
|
5,800
|
4,100
|
|
| Residential first mortgage |
|
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
|
| Loans held-for-sale |
|
|
|
|
9
|
632
|
508
|
| Reduction in allowance |
8
|
19
|
19
|
60
|
87
|
38
|
133
|
| Other |
|
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
|
| Loans held-for-sale |
|
|
|
|
8
|
20
|
|
| Reduction in allowance |
1
|
1
|
2
|
1
|
4
|
2
|
4
|
| HELOC |
|
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
|
| Reduction in allowance |
0
|
0
|
1
|
1
|
3
|
6
|
5
|
| Purchase of HELOC loans |
|
|
|
|
197
|
|
|
| Premium on HELOC loans |
|
|
|
|
7
|
|
|
| Residential first mortgage |
|
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
|
| Unpaid principal balance |
|
|
|
|
601
|
|
|
| Loans held-for-sale |
|
|
|
|
427
|
|
|
| Reduction in allowance |
2
|
|
8
|
51
|
69
|
9
|
66
|
| Gain (loss) on sale from transfer of loans to held-for-sale |
|
|
|
|
$ (1)
|
$ (11)
|
$ (1)
|
| Financing Receivable, Significant Purchases |
|
|
150
|
197
|
|
|
|
| Financing Receivable, Significant Sales |
|
|
1,200
|
386
|
|
|
|
| Premiums Receivable, Gross |
1
|
$ 7
|
1
|
7
|
|
|
|
| Gain (Loss) on Disposition of Other Assets |
|
|
14
|
(1)
|
|
|
|
| Residential first mortgage | Nonperforming Financial Instruments |
|
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
|
| Financing Receivable, Significant Sales |
|
|
110
|
$ 401
|
|
|
|
| Loans Insured or Guaranteed by US Government Authorities |
|
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
|
| Reduction in allowance |
$ 4
|
|
|
|
|
|
|
| Financing Receivable, Significant Sales |
|
|
$ 7
|
|
|
|
|