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Total Equity and Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] |  |
Net unrealized gains (losses) on securities, pre-tax | $ 654 | $ (6,318)
Less: Net realized gains (losses) reclassified to earnings | (215) | (3)
Net increase (decrease), pre-tax | 869 | (6,315)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract] |  |
Net unrealized gains (losses) on securities, tax effect | (154) | 1,489
Less: Net realized gains (losses) reclassified to earnings, tax effect | 51 | 1
Effect of income taxes | (205) | 1,488
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, After Reclassification Adjustments, after Tax [Abstract] |  |
Net unrealized gains (losses) on securities, after tax | 500 | (4,829)
Less: Net realized gains (losses) reclassified to earnings, after tax | (164) | (2)
Net increase (decrease), after-tax | 664 | (4,827)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |
Net unrealized gains (losses) on cash flow hedges, pre-tax | 197 | (1,656)
Less: Net realized gains (losses) reclassified to earnings, pre-tax | (330) | 102
Net increase (decrease), pre-tax | 527 | (1,758)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract] |  |
Net unrealized gains (losses) on cash flow hedges, tax effect | (46) | 390
Less: Net realized gains (losses) reclassified to earnings, tax effect | 78 | (24)
Effect of income taxes | (124) | 414
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] |  |
Net unrealized gains (losses) on cash flow hedges, after tax | 151 | (1,266)
Less: Net realized gains (losses) reclassified to earnings, after tax | (252) | 78
Net increase (decrease), after-tax | 403 | (1,344)
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 | (10) | 54
Net increase (decrease), pre-tax | (10) | 54
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 | (13)
Effect of income taxes | 2 | (13)
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 | (8) | 41
Net increase (decrease), after-tax | (8) | 41
Other Comprehensive Income Other Adjustments [Abstract] |  |
Net unrealized gains (losses) on other transactions, pre-tax | 4 | (3)
Net increase (decrease), pre-tax | 4 | (3)
Net unrealized gains (losses) on other transactions, tax effect | 1 | (7)
Effect of income taxes | 1 | (7)
Net unrealized gains (losses) on other transactions, after tax | 5 | (10)
Net increase (decrease), after-tax | 5 | (10)
Other comprehensive income (loss), before tax and net of reclassifications into Net income | 1,390 | (8,022)
Total other comprehensive income (loss), tax effect | (326) | 1,882
Other comprehensive income (loss), after tax and net of reclassifications into Net income | $ 1,064 | $ (6,140)

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