Consolidated Statements of Cash Flows - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities          
Net income (loss) $ 86,000,000 $ 78,000,000 $ 158,000,000 $ (69,000,000) $ 267,000,000
Adjustments to reconcile net income (loss) to net cash used in operating activities:          
(Benefit) provision for loan losses (16,000,000) (17,000,000) (19,000,000) 132,000,000 70,000,000
Representation and warranty (benefit) provision (6,000,000) (7,000,000) (19,000,000) 10,000,000 36,000,000
Depreciation and amortization 16,000,000 11,000,000 24,000,000 24,000,000 23,000,000
Changes in valuation allowance on deferred tax assets     11,000,000 8,000,000 (356,000,000)
Deferred income taxes 31,000,000 43,000,000 67,000,000 (36,000,000) (59,000,000)
Change in fair value and other non-cash changes     (132,000,000) (280,000,000) (121,000,000)
Net gain on loan and asset sales (163,000,000) (171,000,000) (288,000,000) (218,000,000) (430,000,000)
Other than temporary impairment losses on investment securities AFS     0 0 9,000,000
Net (gain) loss on transferors' interest     0 0 (46,000,000)
Proceeds from sales of loans held-for-sale (HFS) 9,761,000,000 9,764,000,000 18,467,000,000 17,189,000,000 37,162,000,000
Origination, premium paid and purchase of loans, net of principal repayments (14,639,000,000) (14,458,000,000) (28,008,000,000) (24,899,000,000) (37,957,000,000)
(Increase) decrease in accrued interest receivable 1,000,000 (4,000,000) (8,000,000) 33,000,000 44,000,000
Net proceeds from sales of trading securities     0 0 170,000,000
Decrease (increase) in other assets, excludes purchase of other investments (58,000,000) 43,000,000 211,000,000 (33,000,000) 125,000,000
Net charge-offs in representation and warranty reserve     (1,000,000) (18,000,000) (193,000,000)
Increase (decrease) in other liabilities 31,000,000 6,000,000 (10,000,000) 12,000,000 (306,000,000)
Changes in fair value of MSRs, DOJ liability and long-term debt (197,000,000) (334,000,000)      
Net cash used in operating activities (5,153,000,000) (5,046,000,000) (9,547,000,000) (8,145,000,000) (1,562,000,000)
Investing Activities          
Proceeds from sale of available for sale securities including loans that have been securitized 5,943,000,000 4,558,000,000 9,098,000,000 9,191,000,000 3,412,000,000
Collection of principal on investment securities available-for-sale 68,000,000 124,000,000 218,000,000 160,000,000 55,000,000
Purchase of investment securities available-for-sale and other (68,000,000) (724,000,000) (1,148,000,000) (1,278,000,000) (1,057,000,000)
Collection of principal on investment securities held-to-maturity (HTM) 72,000,000 0 85,000,000 0 0
Purchase of investment securities held-to-maturity (15,000,000) 0 (217,000,000) 0 0
Proceeds received from the sale of held-for-investment (HFI) loans 228,000,000 710,000,000 946,000,000 73,000,000 1,434,000,000
Origination and purchase of loans HFI, net of principal repayments (812,000,000) (1,717,000,000) (3,130,000,000) (923,000,000) 666,000,000
Purchase of bank owned life insurance (85,000,000) (150,000,000) (175,000,000) 0 0
Proceeds from the disposition of repossessed assets 9,000,000 13,000,000 24,000,000 39,000,000 117,000,000
Net (purchase) redemption of Federal Home Loan Bank stock     (15,000,000) 54,000,000 92,000,000
Acquisitions of premises and equipment, net of proceeds (25,000,000) (19,000,000) (46,000,000) (33,000,000) (36,000,000)
Proceeds from the sale of mortgage servicing rights 21,000,000 100,000,000 245,000,000 226,000,000 851,000,000
Net cash provided by investing activities 5,334,000,000 2,937,000,000 5,885,000,000 7,509,000,000 5,534,000,000
Financing Activities          
Net increase (decrease) in deposit accounts 636,000,000 580,000,000 866,000,000 928,000,000 (2,154,000,000)
Proceeds from increases in Federal Home Loan Bank advances 150,000,000 14,480,000,000 37,399,000,000 18,972,000,000 4,315,000,000
Repayment of Federal Home Loan Bank advances 0 (12,796,000,000) (34,372,000,000) (19,446,000,000) (6,507,000,000)
Repayment of trust preferred securities and long-term debt     (88,000,000) (29,000,000) (20,000,000)
Net receipt (disbursement) of payments of loans serviced for others 52,000,000 (3,000,000) (76,000,000) 70,000,000 (278,000,000)
Net receipt (disbursement) of escrow payments 4,000,000 8,000,000 5,000,000 (4,000,000) 0
Repayments of long-term debt 0 (50,000,000)      
Net change in short-term borrowings (1,047,000,000) 0      
Net cash provided by (used in) financing activities (205,000,000) 2,219,000,000 3,734,000,000 491,000,000 (4,644,000,000)
Net increase (decrease) in cash and cash equivalents (24,000,000) 110,000,000 72,000,000 (145,000,000) (672,000,000)
Beginning cash and cash equivalents 208,000,000 136,000,000 136,000,000 281,000,000 953,000,000
Ending cash and cash equivalents 184,000,000 246,000,000 208,000,000 136,000,000 281,000,000
Supplemental disclosure of cash flow information          
Interest paid on deposits and other borrowings 37,000,000 26,000,000 58,000,000 32,000,000 143,000,000
Income tax payments (refund) 2,000,000 3,000,000 6,000,000 (1,000,000) 6,000,000
FHLB prepayment penalty payment     0 0 178,000,000
Non-cash reclassification of investment securities AFS to HTM     1,112,000,000 0 0
Non-cash reclassification of loans originated HFI to loans HFS 1,331,000,000 775,000,000 1,140,000,000 426,000,000 832,000,000
Non-cash reclassification of mortgage loans originated HFS to HFI/Recharacterization of investment securities AFS to loans HFI 0 27,000,000 30,000,000 19,000,000 64,000,000
Non-cash reclassification of mortgage loans HFS to AFS securities 5,768,000,000 4,566,000,000 8,853,000,000 8,800,000,000 3,376,000,000
Initial non-cash reclassification of loans with government guarantees to other assets 0 373,000,000 373,000,000 0 0
Mortgage servicing rights resulting from sale or securitization of loans $ 122,000,000 $ 146,000,000 260,000,000 271,000,000 402,000,000
Reconsolidation of HELOC's of variable interest entities (VIEs)     0 0 171,000,000
Reconsolidation of long-term debt of VIEs     0 0 120,000,000
Available-for-sale Securities          
Supplemental disclosure of cash flow information          
Non-cash reclassification of mortgage loans originated HFS to HFI/Recharacterization of investment securities AFS to loans HFI     $ 0 $ 0 $ 91,000,000