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Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 |  | $ 2,460 | $ (10,581) | $ (2,361)
Debt securities |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |  |
Net unrealized gains (losses) |  | 840 | (10,866) | (2,445)
Less: Net realized gains (losses) reclassified to earnings |  | (913) | (723) | 6
Other comprehensive income (loss), before tax and net of reclassifications into Net income |  | 1,753 | (10,143) | (2,451)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |  |
Net unrealized gains (losses) |  | (202) | 2,561 | 576
Less: Net realized gains (losses) reclassified to earnings |  | 217 | 171 | (2)
Income tax benefit (expense) related to items of other comprehensive income |  | (419) | 2,390 | 578
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |  |
Net unrealized gains (losses) |  | 638 | (8,305) | (1,869)
Less: Net realized gains (losses) reclassified to earnings |  | (696) | (552) | 4
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 1,334 | (7,753) | (1,873)
Cash flow hedge derivatives |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |  |
Net unrealized gains (losses) |  | (237) | (3,536) | (632)
Less: Net realized gains (losses) reclassified to earnings |  | (1,540) | (260) | 494
Other comprehensive income (loss), before tax and net of reclassifications into Net income |  | 1,303 | (3,276) | (1,126)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |  |
Net unrealized gains (losses) |  | 65 | 833 | 149
Less: Net realized gains (losses) reclassified to earnings |  | 376 | 61 | (117)
Income tax benefit (expense) related to items of other comprehensive income |  | (311) | 772 | 266
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |  |
Net unrealized gains (losses) |  | (172) | (2,703) | (483)
Less: Net realized gains (losses) reclassified to earnings |  | (1,164) | (199) | 377
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 992 | (2,504) | (860)
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 |  | 166 | (363) | 486
Other comprehensive income (loss), before tax and net of reclassifications into Net income |  | 166 | (363) | 486
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |  |
Less: Net realized gains (losses) reclassified to earnings |  | (40) | 85 | (114)
Income tax benefit (expense) related to items of other comprehensive income |  | (40) | 85 | (114)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |  |
Less: Net realized gains (losses) reclassified to earnings |  | 126 | (278) | 372
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 126 | (278) | 372
Other |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |  |
Less: Net realized gains (losses) reclassified to earnings |  | 5 | (5) | 4
Other comprehensive income (loss), before tax and net of reclassifications into Net income |  | 5 | (5) | 4
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |  |
Less: Net realized gains (losses) reclassified to earnings |  | 3 | (41) | (4)
Income tax benefit (expense) related to items of other comprehensive income |  | 3 | (41) | (4)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |  |
Less: Net realized gains (losses) reclassified to earnings |  | 8 | (46) |
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 8 | (46) |
Continuing Operations |  |  |  |
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 |  | 3,227 | (13,787) | (3,087)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |  |
Income tax benefit (expense) related to items of other comprehensive income |  | (767) | 3,206 | 726
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 |  | $ 2,460 | $ (10,581) | $ (2,361)

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