Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	$ (12,390)	$ (8,801)
Net change, Tax effect	2,907	1,856
Total other comprehensive income/(loss), after–tax	(9,483)	(6,945)
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(10,202)	(5,693)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	2,450	1,365
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(7,752)	(4,328)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	394	(14)
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	(95)	3
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	299	(11)
Net change, Pre-tax	(9,808)	(5,707)
Net change, Tax effect	2,355	1,368
Total other comprehensive income/(loss), after–tax	(7,453)	(4,339)
Translation adjustments
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(341)	(1,200)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	24	39
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(317)	(1,161)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	338	1,200
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	(83)	(289)
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	255	911
Net change, Pre-tax	(3)	0
Net change, Tax effect	(59)	(250)
Total other comprehensive income/(loss), after–tax	(62)	(250)
Fair value hedges, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	145	(37)
Net change, Tax effect	(35)	9
Total other comprehensive income/(loss), after–tax	110	(28)
Cash flow hedges
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(3,436)	(2,695)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	825	647
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(2,611)	(2,048)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	(237)	(264)
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	57	63
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	(180)	(201)
Net change, Pre-tax	(3,673)	(2,959)
Net change, Tax effect	882	710
Total other comprehensive income/(loss), after–tax	(2,791)	(2,249)
Defined benefit pension and OPEB plans, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	90	91
Net change, Tax effect	(23)	(23)
Total other comprehensive income/(loss), after–tax	67	68
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	859	(189)
Net change, Tax effect	(213)	42
Total other comprehensive income/(loss), after–tax	$ 646	$ (147)

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