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Other Comprehensive Income (Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |
Increase in net unrealized gains (losses) on securities, pre-tax | $ (10,866) | $ (2,445) | $ 2,113
Less: Net realized gains (losses) reclassified to earnings, pre-tax | (723) | 6 | 302
Net increase (decrease), pre-tax | (10,143) | (2,451) | 1,811
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |
Increase in net unrealized gains (losses) on securities, tax effect | 2,561 | 576 | (485)
Less: Net realized gains (losses) reclassified to earnings, tax effect | 171 | (2) | (69)
Effect of income taxes | 2,390 | 578 | (416)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |
Increase in net unrealized gains (losses) on securities, after tax | (8,305) | (1,869) | 1,628
Less: Net realized gains (losses) reclassified to earnings, after tax | (552) | 4 | 233
Net increase (decrease), after-tax | (7,753) | (1,873) | 1,395
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract] |  |  |
Increase in net unrealized gains (losses) on cash flow hedges, pre-tax | (3,536) | (632) | 918
Less: Net realized gains (losses) reclassified to earnings, pre-tax | (260) | 494 | 421
Net increase (decrease), pre-tax | (3,276) | (1,126) | 497
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract] |  |  |
Increase in net unrealized gains (losses) on cash flow hedges, tax effect | 833 | 149 | (211)
Less: Net realized gains (losses) reclassified to earnings, tax effect | 61 | (117) | (97)
Effect of income taxes | 772 | 266 | (114)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] |  |  |
Increase in net unrealized gains (losses) on cash flow hedges, after tax | (2,703) | (483) | 707
Less: Net realized gains (losses) reclassified to earnings, after tax | (199) | 377 | 324
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | (2,504) | (860) | 383
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax [Abstract] |  |  |
Net pension and other postretirement benefit plan activity and other reclassified to earnings, pre-tax | (363) | 486 | 82
Net increase (decrease), pre-tax | (363) | 486 | 82
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax [Abstract] |  |  |
Net pension and other postretirement benefit plan activity and other reclassified to earnings, tax effect | 85 | (114) | (19)
Net increase (decrease), tax | 85 | (114) | (19)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] |  |  |
Net pension and other postretirement benefit plan activity and other reclassified to earnings, after-tax | (278) | 372 | 63
Net increase (decrease), after-tax | (278) | 372 | 63
Other Comprehensive Income Other Adjustments [Abstract] |  |  |
Net unrealized gains (losses) on other transactions, pre-tax | (5) | 4 | 10
Total Other, net activity, Before tax | (5) | 4 | 10
Net unrealized gains (losses) on other transactions, tax effect | (41) | (4) | 5
Effect of income taxes | (41) | (4) | 5
Net unrealized gains (losses) on other transactions, after tax | (46) |  | 15
Total Other, net activity, After tax | (46) |  | 15
Other comprehensive income (loss), before tax and net of reclassifications into Net income | (13,787) | (3,087) | 2,548
Income tax benefit (expense) related to items of other comprehensive income | 3,206 | 726 | (577)
Other comprehensive income (loss), after tax and net of reclassifications into Net income | (10,581) | (2,361) | 1,971
Continuing Operations |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |
Net unrealized gains (losses) on other transactions, pre-tax | (5) | 4 | 10
Other comprehensive income (loss), before tax and net of reclassifications into Net income | (13,787) | (3,087) | 2,400
Income tax benefit (expense) related to items of other comprehensive income | 3,206 | 726 | (544)
Other comprehensive income (loss), after tax and net of reclassifications into Net income | (10,581) | (2,361) | 1,856
Discontinued Operations |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |
Other comprehensive income (loss), before tax and net of reclassifications into Net income |  |  | 148
Income tax benefit (expense) related to items of other comprehensive income |  |  | (33)
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  |  | $ 115

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