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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance     $ 1,156  
Other comprehensive income (loss), net of tax $ (148) $ 283 2,685 $ 1,716
AOCI ending balance 3,833   3,833  
Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance 2,373 125 935 (439)
Other comprehensive income (loss) before reclassifications 20 103 1,466 697
Amounts reclassified from AOCI into earnings (19) (3) (19) (33)
Other comprehensive income (loss), net of tax 1 100 1,447 664
AOCI ending balance 2,374 225 2,374 225
Accumulated Net Unrealized Investment Gain (Loss) | Securities Held to Maturity        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance   (178)   (190)
Other comprehensive income (loss) before reclassifications   0   0
Amounts reclassified from AOCI into earnings   8   20
Other comprehensive income (loss), net of tax   8   20
AOCI ending balance   (170)   (170)
Hedging Relationships        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance 1,785 396 354 (418)
Other comprehensive income (loss) before reclassifications (95) 218 1,540 735
Amounts reclassified from AOCI into earnings (80) (29) (284) 268
Other comprehensive income (loss), net of tax (175) 189 1,256 1,003
AOCI ending balance 1,610 585 1,610 585
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance (151) (132) (107) (177)
Other comprehensive income (loss) before reclassifications 28 (12) (16) 33
Amounts reclassified from AOCI into earnings 0 0 0 0
Other comprehensive income (loss), net of tax 28 (12) (16) 33
AOCI ending balance (123) (144) (123) (144)
Other        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance (26) (41) (26) (39)
Other comprehensive income (loss) before reclassifications 0 0 0 (1)
Amounts reclassified from AOCI into earnings (2) (2) (2) (3)
Other comprehensive income (loss), net of tax (2) (2) (2) (4)
AOCI ending balance (28) (43) (28) (43)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance 3,981 170 1,156 (1,263)
Other comprehensive income (loss) before reclassifications (47) 309 2,990 1,464
Amounts reclassified from AOCI into earnings (101) (26) (305) 252
Other comprehensive income (loss), net of tax (148) 283 2,685 1,716
AOCI ending balance 3,833 453 3,833 453
Net investment hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Gains (losses) recorded in AOCI $ (75) $ 67 59 $ 86
Cumulative effects from adoption of the CECL standard | Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance     (8)  
Cumulative effects from adoption of the CECL standard | Hedging Relationships        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance     0  
Cumulative effects from adoption of the CECL standard | Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance     0  
Cumulative effects from adoption of the CECL standard | Other        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance     0  
Cumulative effects from adoption of the CECL standard | Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
AOCI beginning balance     $ (8)