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Fair Value - Schedule of Fair Value Measurements, Assets, Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period $ 2,127 $ 1,345
Total realized and unrealized gain (losses) recorded in revenue 1 (3)
Total realized and unrealized gain (losses) recorded in other comprehensive income (11) 1
Purchases 865 1,776
Sales (1,042) (350)
Settlements (377) (605)
Transfers into Level 3 122 372
Transfers out of Level 3 (397) (409)
Fair value, end of period 1,288 2,127
Change in unrealized gains (losses) related to financial instruments held (3) (3)
Derivative instruments, assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 1 8
Total realized and unrealized gain (losses) recorded in revenue (3) (7)
Total realized and unrealized gain (losses) recorded in other comprehensive income 0 0
Purchases 6 4
Sales 0 0
Settlements 0 (4)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, end of period 4 1
Change in unrealized gains (losses) related to financial instruments held (3) (3)
Foreign exchange contracts    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 1 8
Total realized and unrealized gain (losses) recorded in revenue (3) (7)
Total realized and unrealized gain (losses) recorded in other comprehensive income 0 0
Purchases 6 4
Sales 0 0
Settlements 0 (4)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, end of period 4 1
Change in unrealized gains (losses) related to financial instruments held (3) (3)
US Treasury and federal agencies, mortgage-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 0 0
Total realized and unrealized gain (losses) recorded in revenue   0
Total realized and unrealized gain (losses) recorded in other comprehensive income   0
Purchases   0
Sales   0
Settlements   0
Transfers into Level 3   25
Transfers out of Level 3   (25)
Fair value, end of period   0
Asset-backed securities, student loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 0 97
Total realized and unrealized gain (losses) recorded in revenue   0
Total realized and unrealized gain (losses) recorded in other comprehensive income   1
Purchases   200
Sales   0
Settlements   0
Transfers into Level 3   0
Transfers out of Level 3   (298)
Fair value, end of period   0
Asset-backed securities, collateralized loan obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 1,358 905
Total realized and unrealized gain (losses) recorded in revenue 4 3
Total realized and unrealized gain (losses) recorded in other comprehensive income (7) 0
Purchases 351 1,035
Sales (636) (240)
Settlements (268) (620)
Transfers into Level 3 0 275
Transfers out of Level 3 (209) 0
Fair value, end of period 593 1,358
Asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 1,358 1,002
Total realized and unrealized gain (losses) recorded in revenue 4 3
Total realized and unrealized gain (losses) recorded in other comprehensive income (7) 1
Purchases 351 1,235
Sales (636) (240)
Settlements (268) (620)
Transfers into Level 3 0 275
Transfers out of Level 3 (209) (298)
Fair value, end of period 593 1,358
Non-U.S. debt securities, mortgage-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 119 0
Total realized and unrealized gain (losses) recorded in revenue 0 0
Total realized and unrealized gain (losses) recorded in other comprehensive income 0 (2)
Purchases 0 119
Sales 0 0
Settlements 0 2
Transfers into Level 3 0 0
Transfers out of Level 3 (119) 0
Fair value, end of period 0 119
Non-U.S. debt securities, asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 402 32
Total realized and unrealized gain (losses) recorded in revenue 0 1
Total realized and unrealized gain (losses) recorded in other comprehensive income (4) 0
Purchases 495 370
Sales (310) (10)
Settlements (66) (11)
Transfers into Level 3 114 67
Transfers out of Level 3 0 (47)
Fair value, end of period 631 402
Non-U.S. debt securities, other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 204 248
Total realized and unrealized gain (losses) recorded in revenue 0 0
Total realized and unrealized gain (losses) recorded in other comprehensive income 0 1
Purchases 13 5
Sales (59) (81)
Settlements (36) 31
Transfers into Level 3 0 0
Transfers out of Level 3 (64) 0
Fair value, end of period 58 204
Total non-U.S. debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 725 280
Total realized and unrealized gain (losses) recorded in revenue 0 1
Total realized and unrealized gain (losses) recorded in other comprehensive income (4) (1)
Purchases 508 494
Sales (369) (91)
Settlements (102) 22
Transfers into Level 3 114 67
Transfers out of Level 3 (183) (47)
Fair value, end of period 689 725
State and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 43 39
Total realized and unrealized gain (losses) recorded in revenue 0 0
Total realized and unrealized gain (losses) recorded in other comprehensive income 0 2
Purchases 0 0
Sales (37) 0
Settlements (1) (3)
Transfers into Level 3 0 5
Transfers out of Level 3 (5) 0
Fair value, end of period 0 43
Investment securities available-for-sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 2,126 1,337
Total realized and unrealized gain (losses) recorded in revenue 4 4
Total realized and unrealized gain (losses) recorded in other comprehensive income (11) 1
Purchases 859 1,772
Sales (1,042) (350)
Settlements (377) (601)
Transfers into Level 3 122 372
Transfers out of Level 3 (397) (409)
Fair value, end of period 1,284 2,126
Collateralized mortgage obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 0 16
Total realized and unrealized gain (losses) recorded in revenue 0 0
Total realized and unrealized gain (losses) recorded in other comprehensive income 0 (1)
Purchases 0 24
Sales 0 0
Settlements (6) 0
Transfers into Level 3 8 0
Transfers out of Level 3 0 (39)
Fair value, end of period 2 0
Other U.S. debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period $ 0 0
Total realized and unrealized gain (losses) recorded in revenue   0
Total realized and unrealized gain (losses) recorded in other comprehensive income   0
Purchases   19
Sales   (19)
Settlements   0
Transfers into Level 3   0
Transfers out of Level 3   0
Fair value, end of period   $ 0