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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

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