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Fair Value Measurement - Level 3 Recurring Fair Value Rollfoward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative, Fair Value, Net [Abstract]      
Derivative assets, gross amount $ 1,729 $ 1,539  
Derivative liabilities, gross amount 1,197 1,201  
Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net Unrealized Gains (Losses) Included in OCI Related to Assets and Liabilities Still Held (4)    
Derivative, Fair Value, Net [Abstract]      
Beginning balance (10) 13 $ 18
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 6 (20) 0
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issuances (16) 13 46
Settlements 52 (17) (44)
Transfers Into Level 3 0 0 0
Transfers Out of Level 3 (6) 1 (7)
Ending balance 26 (10) 13
Derivative assets, gross amount 77 38 37
Derivative liabilities, gross amount 51 48 24
RMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 433 614 518
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 35 32 90
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 5 (8) (24)
Purchases 0 0 0
Sales 0 0 (116)
Issuances 0 0 0
Settlements (63) (74) (92)
Transfers Into Level 3 177 203 572
Transfers Out of Level 3 (158) (334) (334)
Ending balance 429 433 614
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 34 28 19
CMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 10 14 51
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0 0
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0
Purchases 0 0 110
Sales 0 0 (50)
Issuances 0 0 0
Settlements (2) (4) (4)
Transfers Into Level 3 5 0 0
Transfers Out of Level 3 0 0 (93)
Ending balance 13 10 14
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 0 0
Other securities | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 0 5 9
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income   0 0
Total Gains or (Losses) (Realized/Unrealized), Included in OCI   0 0
Purchases   0 0
Sales   0 0
Issuances   0 0
Settlements   (5) (4)
Transfers Into Level 3   0 0
Transfers Out of Level 3   0 0
Ending balance   0 5
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held   0 0
Available-for-sale securities | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 443 633 578
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 35 32 90
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 5 (8) (24)
Purchases 0 0 110
Sales 0 0 (166)
Issuances 0 0 0
Settlements (65) (83) (100)
Transfers Into Level 3 182 203 572
Transfers Out of Level 3 (158) (334) (427)
Ending balance 442 443 633
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 34 28 19
Consumer MSRs | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 0 92 80
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income   3 (5)
Total Gains or (Losses) (Realized/Unrealized), Included in OCI   0 0
Purchases   0 0
Sales   (97) (3)
Issuances   2 27
Settlements   0 (7)
Transfers Into Level 3   0 0
Transfers Out of Level 3   0 0
Ending balance   0 92
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held   0 (5)
Retained interest in securitizations | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 158 172 201
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 18 (14) (29)
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements (110) 0 0
Transfers Into Level 3 0 0 0
Transfers Out of Level 3 0 0 0
Ending balance 66 158 172
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (19) (14) (29)
Net derivative assets (liabilities) | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ 1 $ (20) $ 0