Accumulated Other Comprehensive Income/(Loss) - Components of Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Unrealized gains/(losses) on AFS securities:
Net change, Pre-tax	$ (21,744)	$ (10,099)	$ 8,066
Net change, Tax effect	4,487	2,029	(1,649)
Total other comprehensive income/(loss), after–tax	(17,257)	(8,070)	6,417
Net pre-tax gains (losses) reclassified related to liquidation of legal entity	(8)
Decrease in accumulated other comprehensive income as a result of settlement and remeasurement of the plan	1,400
Other Expense
Unrealized gains/(losses) on AFS securities:
Net pre-tax gains (losses) reclassified related to liquidation of legal entity		(7)
Other Income
Unrealized gains/(losses) on AFS securities:
Net pre-tax gains (losses) reclassified related to liquidation of legal entity			6
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(17,862)	(7,634)	6,228
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	4,290	1,832	(1,495)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(13,572)	(5,802)	4,733
Reclassification, Pre-tax	2,380	345	(802)
Reclassification, Tax effect	(572)	(83)	192
Reclassification, After-tax	1,808	262	(610)
Net change, Pre-tax	(15,482)	(7,289)	5,426
Net change, Tax effect	3,718	1,749	(1,303)
Total other comprehensive income/(loss), after–tax	(11,764)	(5,540)	4,123
Unrealized gains/(losses) on investment securities \| Other Income
Unrealized gains/(losses) on AFS securities:
Net pre-tax gains (losses) reclassified related to liquidation of legal entity	38	0	3
Translation adjustments
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(3,574)	(2,447)	1,407
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	265	125	(103)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(3,309)	(2,322)	1,304
Reclassification, Pre-tax	3,553	2,452	(1,411)
Reclassification, Tax effect	(855)	(591)	341
Reclassification, After-tax	2,698	1,861	(1,070)
Net change, Pre-tax	(21)	5	(4)
Net change, Tax effect	(590)	(466)	238
Total other comprehensive income/(loss), after–tax	(611)	(461)	234
Translation adjustments \| Other Expense
Unrealized gains/(losses) on AFS securities:
Net pre-tax gains (losses) reclassified related to liquidation of legal entity	(46)
Fair value hedges, net of change
Unrealized gains/(losses) on AFS securities:
Net change, Pre-tax	130	(26)	25
Net change, Tax effect	(32)	7	(6)
Total other comprehensive income/(loss), after–tax	98	(19)	19
Cash flow hedges
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(7,473)	(2,303)	3,623
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	1,794	553	(870)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(5,679)	(1,750)	2,753
Reclassification, Pre-tax	420	(1,222)	(570)
Reclassification, Tax effect	(101)	293	137
Reclassification, After-tax	319	(929)	(433)
Net change, Pre-tax	(7,053)	(3,525)	3,053
Net change, Tax effect	1,693	846	(733)
Total other comprehensive income/(loss), after–tax	(5,360)	(2,679)	2,320
Defined benefit pension and OPEB plans
Unrealized gains/(losses) on AFS securities:
Net change, Pre-tax	(1,459)	1,129	214
Net change, Tax effect	218	(207)	(2)
Total other comprehensive income/(loss), after–tax	(1,241)	922	212
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on AFS securities:
Net change, Pre-tax	2,141	(393)	(648)
Net change, Tax effect	(520)	100	157
Total other comprehensive income/(loss), after–tax	$ 1,621	$ (293)	$ (491)

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