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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)