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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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