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Total Equity and Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |
Net unrealized gains (losses) on securities, pre-tax | $ (6,318) | $ (1,181)
Less: Net realized gains (losses) reclassified to earnings | (3) | 13
Net increase (decrease), pre-tax | (6,315) | (1,194)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |
Net unrealized gains (losses) on securities, tax effect | 1,489 | 278
Less: Net realized gains (losses) reclassified to earnings, tax effect | 1 | (3)
Effect of income taxes | 1,488 | 281
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |
Net unrealized gains (losses) on securities, after tax | (4,829) | (903)
Less: Net realized gains (losses) reclassified to earnings, after tax | (2) | 10
Net increase (decrease), after-tax | (4,827) | (913)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |
Net unrealized gains (losses) on cash flow hedges, pre-tax | (1,656) | (640)
Less: Net realized gains (losses) reclassified to earnings, pre-tax | 102 | 135
Net increase (decrease), pre-tax | (1,758) | (775)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract] |  |
Net unrealized gains (losses) on cash flow hedges, tax effect | 390 | 151
Less: Net realized gains (losses) reclassified to earnings, tax effect | (24) | (32)
Effect of income taxes | 414 | 183
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] |  |
Net unrealized gains (losses) on cash flow hedges, after tax | (1,266) | (489)
Less: Net realized gains (losses) reclassified to earnings, after tax | 78 | 103
Net increase (decrease), after-tax | (1,344) | (592)
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 | 54 | 30
Net increase (decrease), pre-tax | 54 | 30
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 | (13) | (7)
Effect of income taxes | (13) | (7)
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 | 41 | 23
Net increase (decrease), after-tax | 41 | 23
Other Comprehensive Income Other Adjustments [Abstract] |  |
Net unrealized gains (losses) on other transactions, pre-tax | (3) | 1
Net increase (decrease), pre-tax | (3) | 1
Net unrealized gains (losses) on other transactions, tax effect | (7) | 1
Effect of income taxes | (7) | 1
Net unrealized gains (losses) on other transactions, after tax | (10) | 2
Net increase (decrease), after-tax | (10) | 2
Other comprehensive income (loss), before tax and net of reclassifications into Net income | (8,022) | (1,938)
Total other comprehensive income (loss), tax effect | 1,882 | 458
Other comprehensive income (loss), after tax and net of reclassifications into Net income | $ (6,140) | $ (1,480)

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