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Fair Values of Assets and Liabilities - Changes in Fair Value for All Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Non-Agency Prime [Member] | Mortgage-Backed Securities Residential [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning of Period Balance $ 363 $ 447 $ 405 $ 478
Net Gains (Losses) Included in Other Comprehensive Income (Loss)   2 (2) 14
Principal Payments (25) (23) (65) (66)
Settlements 0 0 0 0
End of Period Balance 338 426 338 426
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Still Held at End of Period   2 (2) 14
Non-Agency Non-Prime [Member] | Mortgage-Backed Securities Residential [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning of Period Balance 262 286 280 297
Net Gains (Losses) Included in Net Income (1)   (1) (4)
Net Gains (Losses) Included in Other Comprehensive Income (Loss) 1 6 1 14
Principal Payments (11) (8) (29) (23)
Settlements 0 0 0 0
End of Period Balance 251 284 251 284
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Still Held at End of Period 1 6 1 14
Corporate Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning of Period Balance 9 9 9 9
Settlements 0 0 0 0
End of Period Balance 9 9 9 9
Asset-Backed Securities Other [Member] | Asset-Backed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning of Period Balance 58 66 62 63
Net Gains (Losses) Included in Net Income 2   4 2
Net Gains (Losses) Included in Other Comprehensive Income (Loss) (1)   (1) 1
Purchases       4
Principal Payments (3) (2) (9) (6)
Settlements 0 0 0 0
End of Period Balance 56 64 56 64
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Still Held at End of Period (1)   (1) 1
Mortgage Servicing Rights [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning of Period Balance 2,481 2,412 2,338 2,680
Net Gains (Losses) Included in Net Income (273) (61) (454) (345)
Purchases 7 1 22 3
Sales       (141)
Issuances 182 109 491 264
Settlements 0 0 0 0
End of Period Balance 2,397 2,461 2,397 2,461
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Still Held at End of Period (273) (61) (454) (345)
Available-for-Sale Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning of Period Balance 692 808 756 847
Net Gains (Losses) Included in Net Income 1   3 (2)
Net Gains (Losses) Included in Other Comprehensive Income (Loss)   8 (2) 29
Purchases       4
Principal Payments (39) (33) (103) (95)
Settlements 0 0 0 0
End of Period Balance 654 783 654 783
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Still Held at End of Period   8 (2) 29
Derivative [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning of Period Balance 478 558 574 445
Net Gains (Losses) Included in Net Income 426 95 725 568
Net Gains (Losses) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases       1
Sales (2) (1) (7) (1)
Principal Payments 0 0 0 0
Issuances 0 0 0 0
Settlements (219) (187) (609) (548)
End of Period Balance 683 465 683 465
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Still Held at End of Period $ 231 $ (15) $ 203 $ 80