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Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |
Other comprehensive income (loss), before tax and net of reclassifications into Net income | $ 1,514 | $ 3,227 | $ (13,787)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |
Income tax benefit (expense) related to items of other comprehensive income | (367) | (767) | 3,206
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 1,147 | 2,460 | (10,581)
Debt securities |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |
Net unrealized gains (losses) | (363) | 840 | (10,866)
Less: Net realized gains (losses) reclassified to earnings | (1,328) | (913) | (723)
Other comprehensive income (loss), before tax and net of reclassifications into Net income | 965 | 1,753 | (10,143)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |
Net unrealized gains (losses) | 89 | (202) | 2,561
Less: Net realized gains (losses) reclassified to earnings | 323 | 217 | 171
Income tax benefit (expense) related to items of other comprehensive income | (234) | (419) | 2,390
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |
Net unrealized gains (losses) | (274) | 638 | (8,305)
Less: Net realized gains (losses) reclassified to earnings | (1,005) | (696) | (552)
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 731 | 1,334 | (7,753)
Cash flow hedge derivatives |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |
Net unrealized gains (losses) | (790) | (237) | (3,536)
Less: Net realized gains (losses) reclassified to earnings | (1,317) | (1,540) | (260)
Other comprehensive income (loss), before tax and net of reclassifications into Net income | 527 | 1,303 | (3,276)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |
Net unrealized gains (losses) | 192 | 65 | 833
Less: Net realized gains (losses) reclassified to earnings | 320 | 376 | 61
Income tax benefit (expense) related to items of other comprehensive income | (128) | (311) | 772
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |
Net unrealized gains (losses) | (598) | (172) | (2,703)
Less: Net realized gains (losses) reclassified to earnings | (997) | (1,164) | (199)
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 399 | 992 | (2,504)
Pension and other postretirement benefit plan adjustments |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |
Less: Net realized gains (losses) reclassified to earnings | 21 | 166 | (363)
Other comprehensive income (loss), before tax and net of reclassifications into Net income | 21 | 166 | (363)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |
Less: Net realized gains (losses) reclassified to earnings | (5) | (40) | 85
Income tax benefit (expense) related to items of other comprehensive income | (5) | (40) | 85
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |
Less: Net realized gains (losses) reclassified to earnings | 16 | 126 | (278)
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 16 | 126 | (278)
Other |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |
Less: Net realized gains (losses) reclassified to earnings | 1 | 5 | (5)
Other comprehensive income (loss), before tax and net of reclassifications into Net income | 1 | 5 | (5)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |
Less: Net realized gains (losses) reclassified to earnings |  | 3 | (41)
Income tax benefit (expense) related to items of other comprehensive income |  | 3 | (41)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |
Less: Net realized gains (losses) reclassified to earnings | 1 | 8 | (46)
Other comprehensive income (loss), after tax and net of reclassifications into Net income | $ 1 | $ 8 | $ (46)

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