Accumulated Other Comprehensive Income/(Loss) - Components of Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	$ (1,289)	$ 1,338	$ (4,234)	$ 5,184
Net change, Tax effect	285	530	831	29
Total other comprehensive income/(loss), after–tax	(1,004)	1,868	(3,403)	5,213
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	28	(301)	(3,079)	919
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(7)	72	747	(223)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	21	(229)	(2,332)	696
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	395	54	331	91
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(96)	(13)	(80)	(22)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	299	41	251	69
Net change, Pre-tax	423	(247)	(2,748)	1,010
Net change, Tax effect	(103)	59	667	(245)
Total other comprehensive income/(loss), after–tax	320	(188)	(2,081)	765
Translation adjustments
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(47)	4,231	(1,119)	6,442
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(16)	(173)	82	(278)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(63)	4,058	(1,037)	6,164
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	57	(4,213)	1,122	(6,347)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(15)	1,023	(273)	1,540
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	42	(3,190)	849	(4,807)
Net change, Pre-tax	10	18	3	95
Net change, Tax effect	(31)	850	(191)	1,262
Total other comprehensive income/(loss), after–tax	(21)	868	(188)	1,357
Fair value hedges, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(12)	(10)	43	27
Net change, Tax effect	3	2	(11)	(7)
Total other comprehensive income/(loss), after–tax	(9)	(8)	32	20
Cash flow hedges
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(1,716)	1,422	(3,275)	3,009
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	417	(344)	796	(727)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(1,299)	1,078	(2,479)	2,282
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	463	592	832	1,213
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(112)	(141)	(202)	(292)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	351	451	630	921
Net change, Pre-tax	(1,253)	2,014	(2,443)	4,222
Net change, Tax effect	305	(485)	594	(1,019)
Total other comprehensive income/(loss), after–tax	(948)	1,529	(1,849)	3,203
Defined benefit pension and OPEB plans, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	51	(36)	58	(55)
Net change, Tax effect	(14)	8	(17)	11
Total other comprehensive income/(loss), after–tax	37	(28)	41	(44)
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(508)	(401)	853	(115)
Net change, Tax effect	125	96	(211)	27
Total other comprehensive income/(loss), after–tax	$ (383)	$ (305)	$ 642	$ (88)

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