Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	$ 3,597	$ (12,390)
Net change, Tax effect	(674)	2,907
Total other comprehensive income/(loss), after–tax	2,923	(9,483)
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	2,042	(10,202)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(490)	2,450
Net unrealized gains/(losses) arising during the period/Translation, After-tax	1,552	(7,752)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	868	394
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	(208)	(95)
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	660	299
Net change, Pre-tax	2,910	(9,808)
Net change, Tax effect	(698)	2,355
Total other comprehensive income/(loss), after–tax	2,212	(7,453)
Translation adjustments
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	973	(341)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(41)	24
Net unrealized gains/(losses) arising during the period/Translation, After-tax	932	(317)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	(963)	338
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	228	(83)
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	(735)	255
Net change, Pre-tax	10	(3)
Net change, Tax effect	187	(59)
Total other comprehensive income/(loss), after–tax	197	(62)
Reclassification of pre-tax loss related to net investment hedges	(41)
Translation adjustments \| Other Income
Unrealized gains/(losses) on investment securities:
Reclassification of pre-tax loss related to liquidation of legal entity	(5)
Reclassification of pre-tax loss related to net investment hedges	(41)
Fair value hedges, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(28)	145
Net change, Tax effect	7	(35)
Total other comprehensive income/(loss), after–tax	(21)	110
Cash flow hedges
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	567	(3,436)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(136)	825
Net unrealized gains/(losses) arising during the period/Translation, After-tax	431	(2,611)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	483	(237)
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	(116)	57
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	367	(180)
Net change, Pre-tax	1,050	(3,673)
Net change, Tax effect	(252)	882
Total other comprehensive income/(loss), after–tax	798	(2,791)
Defined benefit pension and OPEB plans, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(71)	90
Net change, Tax effect	16	(23)
Total other comprehensive income/(loss), after–tax	(55)	67
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(274)	859
Net change, Tax effect	66	(213)
Total other comprehensive income/(loss), after–tax	$ (208)	$ 646

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