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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance |  |  | $ (8,268) |
Other comprehensive income (loss) before reclassifications | $ 3,110 | $ (2,571) | 1,257 | $ (2,916)
Amounts reclassified from AOCI into earnings | 304 | 165 | 724 | 608
Other comprehensive income (loss), net of tax | 3,414 | (2,406) | 1,981 | (2,308)
AOCI ending balance | (6,287) |  | (6,287) |
Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | (7,797) | (7,602) | (6,769) | (7,676)
Other comprehensive income (loss) before reclassifications | 2,274 | (2,108) | 1,246 | (2,034)
Amounts reclassified from AOCI into earnings | 26 | 0 | 26 | 0
Other comprehensive income (loss), net of tax | 2,300 | (2,108) | 1,272 | (2,034)
AOCI ending balance | (5,497) | (9,710) | (5,497) | (9,710)
Hedging relationships: |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | (1,885) | (2,205) | (1,493) | (2,182)
Other comprehensive income (loss) before reclassifications | 791 | (424) | (21) | (890)
Amounts reclassified from AOCI into earnings | 278 | 165 | 698 | 608
Other comprehensive income (loss), net of tax | 1,069 | (259) | 677 | (282)
AOCI ending balance | (816) | (2,464) | (816) | (2,464)
Foreign Currency Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | 12 | 27 | 26 | (20)
Other comprehensive income (loss) before reclassifications | 45 | (39) | 31 | 8
Amounts reclassified from AOCI into earnings | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 45 | (39) | 31 | 8
AOCI ending balance | 57 | (12) | 57 | (12)
Other: |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | (31) | (38) | (32) | (38)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 1 | 0
Amounts reclassified from AOCI into earnings | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 0 | 0 | 1 | 0
AOCI ending balance | (31) | (38) | (31) | (38)
Total |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
AOCI beginning balance | (9,701) | (9,818) | (8,268) | (9,916)
AOCI ending balance | (6,287) | (12,224) | (6,287) | (12,224)
Net investment hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Other comprehensive gain (loss) | $ (134) | $ 115 | $ (72) | $ (1)

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