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Total Equity and Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |  |  |
Net unrealized gains (losses) on securities, pre-tax | $ (2,929) | $ 55 | $ (9,247) | $ (1,126)
Less: Net realized gains (losses) reclassified to earnings | (214) | 9 | (217) | 22
Net increase (decrease), pre-tax | (2,715) | 46 | (9,030) | (1,148)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |  |  |
Net unrealized gains (losses) on securities, tax effect | 690 | (13) | 2,179 | 265
Less: Net realized gains (losses) reclassified to earnings, tax effect | 50 | (2) | 51 | (5)
Effect of income taxes | 640 | (11) | 2,128 | 270
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |  |  |
Net unrealized gains (losses) on securities, after tax | (2,239) | 42 | (7,068) | (861)
Less: Net realized gains (losses) reclassified to earnings, after tax | (164) | 7 | (166) | 17
Net increase (decrease), after-tax | (2,075) | 35 | (6,902) | (878)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |  |  |
Net unrealized gains (losses) on cash flow hedges, pre-tax | (676) | 330 | (2,332) | (310)
Less: Net realized gains (losses) reclassified to earnings, pre-tax | 25 | 108 | 127 | 243
Net increase (decrease), pre-tax | (701) | 222 | (2,459) | (553)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract] |  |  |  |
Net unrealized gains (losses) on cash flow hedges, tax effect | 159 | (78) | 549 | 73
Less: Net realized gains (losses) reclassified to earnings, tax effect | (6) | (25) | (30) | (57)
Effect of income taxes | 165 | (53) | 579 | 130
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] |  |  |  |
Net unrealized gains (losses) on cash flow hedges, after tax | (517) | 252 | (1,783) | (237)
Less: Net realized gains (losses) reclassified to earnings, after tax | 19 | 83 | 97 | 186
Net increase (decrease), after-tax | (536) | 169 | (1,880) | (423)
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 | 8 | (43) | 62 | (13)
Net increase (decrease), pre-tax | 8 | (43) | 62 | (13)
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 | (2) | 10 | (15) | 3
Effect of income taxes | (2) | 10 | (15) | 3
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 | 6 | (33) | 47 | (10)
Net increase (decrease), after-tax | 6 | (33) | 47 | (10)
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |
Net unrealized gains (losses) on other transactions, pre-tax | (4) |  | (7) | 1
Net increase (decrease), pre-tax | (4) |  | (7) | 1
Net unrealized gains (losses) on other transactions, tax effect | (18) | 2 | (25) | 3
Effect of income taxes | (18) | 2 | (25) | 3
Net unrealized gains (losses) on other transactions, after tax | (22) | 2 | (32) | 4
Net increase (decrease), after-tax | (22) | 2 | (32) | 4
Other comprehensive income (loss), before tax and net of reclassifications into Net income | (3,412) | 225 | (11,434) | (1,713)
Total other comprehensive income (loss), tax effect | 785 | (52) | 2,667 | 406
Other comprehensive income (loss), after tax and net of reclassifications into Net income | $ (2,627) | $ 173 | $ (8,767) | $ (1,307)

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