Accumulated Other Comprehensive Income/(Loss) - Components of Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	$ (2,945)	$ 3,846
Net change, Tax effect	546	(501)
Total other comprehensive income/(loss), after–tax	(2,399)	3,345
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(3,107)	1,220
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	754	(295)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(2,353)	925
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	(64)	37
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	16	(9)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	(48)	28
Net change, Pre-tax	(3,171)	1,257
Net change, Tax effect	770	(304)
Total other comprehensive income/(loss), after–tax	(2,401)	953
Translation adjustments
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(1,072)	2,211
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	98	(105)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(974)	2,106
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	1,065	(2,134)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(258)	517
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	807	(1,617)
Net change, Pre-tax	(7)	77
Net change, Tax effect	(160)	412
Total other comprehensive income/(loss), after–tax	(167)	489
Fair value hedges, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	55	37
Net change, Tax effect	(14)	(9)
Total other comprehensive income/(loss), after–tax	41	28
Cash flow hedges
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(1,559)	1,587
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	379	(383)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(1,180)	1,204
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	369	621
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(90)	(151)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	279	470
Net change, Pre-tax	(1,190)	2,208
Net change, Tax effect	289	(534)
Total other comprehensive income/(loss), after–tax	(901)	1,674
Defined benefit pension and OPEB plans, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	7	(19)
Net change, Tax effect	(3)	3
Total other comprehensive income/(loss), after–tax	4	(16)
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	1,361	286
Net change, Tax effect	(336)	(69)
Total other comprehensive income/(loss), after–tax	$ 1,025	$ 217

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