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Stockholders' Equity - Reclassifications from AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest income $ 22,913 $ 23,340 $ 22,875
Interest expense 3,120 5,173 4,301
Non-interest income 1,325 718 1,002
Income from continuing operations before income taxes 3,203 6,874 7,318
Income tax provision 486 1,341 1,293
Net income 2,714 5,546 6,015
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income 414 (360) (84)
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income [Member] | Available-for-sale securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Non-interest income 25 26 (209)
Income tax provision 6 6 (50)
Net income 19 20 (159)
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income [Member] | Securities Held to Maturity      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest income 0 (35) (53)
Income tax provision 0 (9) (13)
Net income 0 (26) (40)
Hedging Relationships | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest rate contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest income 566 (171) (91)
Hedging Relationships | Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign exchange contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest income 10 44 47
Interest expense (3) (2) 0
Non-interest income (57) (341) 191
Income from continuing operations before income taxes 516 (470) 147
Income tax provision 123 (112) 35
Net income 393 (358) 112
Other | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income from continuing operations before income taxes 2 5 4
Income tax provision 0 1 1
Net income $ 2 $ 4 $ 3