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Stockholders' Equity - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Interest income | $ 5,743 | $ 5,460 | $ 11,565 | $ 11,485 |  |  |  |
Interest expense | 396 | 858 | 835 | 1,942 |  |  |  |
Non-interest income | 231 | 166 | 349 | 311 |  |  |  |
Income (loss) from continuing operations before income taxes | 4,568 | (1,460) | 8,764 | (3,363) |  |  |  |
Income tax provision | 1,031 | (543) | 1,900 | (1,106) |  |  |  |
Net income (loss) | 3,536 | (918) | 6,861 | (2,258) |  |  |  |
Accumulated other comprehensive income | 1,792 |  | 1,792 |  |  | $ 3,494 |  |
Other comprehensive income (loss), net of tax | 9 | 302 | (1,702) | 2,833 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Net income (loss) | 244 | (117) | 491 | 204 |  |  |  |
Securities available for sale |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income | 1,089 | 2,373 | 1,089 | 2,373 | $ 1,038 | 2,186 | $ 2,151 | $ 935
Other comprehensive income (loss) before reclassifications | 51 | 222 | (1,094) | 1,446 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | (3) | 0 |  |  |  |
Other comprehensive income (loss), net of tax | 51 | 222 | (1,097) | 1,446 |  |  |  |
Securities available for sale | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Non-interest income | 0 | 0 | 4 | 0 |  |  |  |
Income tax provision | 0 | 0 | 1 | 0 |  |  |  |
Net income (loss) | 0 | 0 | 3 | 0 |  |  |  |
Hedging Relationships |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income | 730 | 1,785 | 730 | 1,785 | 781 | 1,362 | 1,728 | 354
Other comprehensive income (loss) before reclassifications | 193 | (60) | (145) | 1,635 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (244) | 117 | (487) | (204) |  |  |  |
Other comprehensive income (loss), net of tax | (51) | 57 | (632) | 1,431 |  |  |  |
Hedging Relationships | Interest rate contracts | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Interest income | 245 | 142 | 480 | 168 |  |  |  |
Hedging Relationships | Foreign exchange contracts | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Interest income | 0 | 2 | 1 | 9 |  |  |  |
Interest expense | (1) | (1) | (2) | (2) |  |  |  |
Non-interest income | 77 | (299) | 162 | 93 |  |  |  |
Income (loss) from continuing operations before income taxes | 321 | (156) | 641 | 268 |  |  |  |
Income tax provision | 77 | (39) | 154 | 64 |  |  |  |
Net income (loss) | 244 | (117) | 487 | 204 |  |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income | (3) | (151) | (3) | (151) | (12) | (31) | (174) | (107)
Other comprehensive income (loss) before reclassifications | 9 | 23 | 28 | (44) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0 | 0 |  |  |  |
Other comprehensive income (loss), net of tax | 9 | 23 | 28 | (44) |  |  |  |
Other |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income | (24) | (26) | (24) | (26) | (24) | (23) | (26) | (26)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | (1) | 0 |  |  |  |
Other comprehensive income (loss), net of tax | 0 | 0 | (1) | 0 |  |  |  |
Other | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income (loss) from continuing operations before income taxes | 0 | 0 | 1 | 0 |  |  |  |
Income tax provision | 0 | 0 | 0 | 0 |  |  |  |
Net income (loss) | 0 | 0 | 1 | 0 |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income | 1,792 | 3,981 | 1,792 | 3,981 | $ 1,783 | $ 3,494 | $ 3,679 | $ 1,156
Other comprehensive income (loss) before reclassifications | 253 | 185 | (1,211) | 3,037 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (244) | 117 | (491) | (204) |  |  |  |
Other comprehensive income (loss), net of tax | $ 9 | $ 302 | $ (1,702) | $ 2,833 |  |  |  |

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