Accumulated Other Comprehensive Income/(Loss) - Components of Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrealized gains/(losses) on AFS securities:
Net change, Pre-tax	$ (1,631)	$ 8,567	$ (21,744)
Net change, Tax effect	(382)	(1,669)	4,487
Total other comprehensive income/(loss), after–tax	(2,013)	6,898	(17,257)
Decrease in accumulated other comprehensive income as a result of settlement and remeasurement of the plan			1,400
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(1,135)	3,891	(17,862)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	274	(922)	4,290
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(861)	2,969	(13,572)
Reclassification, Pre-tax	1,021	3,180	2,380
Reclassification, Tax effect	(247)	(768)	(572)
Reclassification, After-tax	774	2,412	1,808
Net change, Pre-tax	(114)	7,071	(15,482)
Net change, Tax effect	27	(1,690)	3,718
Total other comprehensive income/(loss), after–tax	(87)	5,381	(11,764)
Translation adjustments
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(4,385)	1,714	(3,574)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	250	(95)	265
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(4,135)	1,619	(3,309)
Reclassification, Pre-tax	4,322	(1,697)	3,553
Reclassification, Tax effect	(1,045)	407	(855)
Reclassification, After-tax	3,277	(1,290)	2,698
Net change, Pre-tax	(63)	17	(21)
Net change, Tax effect	(795)	312	(590)
Total other comprehensive income/(loss), after–tax	(858)	329	(611)
Reclassification of net pre-tax gains (losses)	7	(3)	(8)
Reclassification of pre-tax gains related to net investment hedges	89	(35)	38
Reclassification of pre-tax losses related to cumulative translation adjustments	(82)
Fair value hedges, net of change
Unrealized gains/(losses) on AFS securities:
Net change, Pre-tax	(115)	(134)	130
Net change, Tax effect	28	33	(32)
Total other comprehensive income/(loss), after–tax	(87)	(101)	98
Cash flow hedges
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(3,742)	483	(7,473)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	904	(114)	1,794
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(2,838)	369	(5,679)
Reclassification, Pre-tax	2,579	1,775	420
Reclassification, Tax effect	(623)	(420)	(101)
Reclassification, After-tax	1,956	1,355	319
Net change, Pre-tax	(1,163)	2,258	(7,053)
Net change, Tax effect	281	(534)	1,693
Total other comprehensive income/(loss), after–tax	(882)	1,724	(5,360)
Defined benefit pension and OPEB plans
Unrealized gains/(losses) on AFS securities:
Net change, Pre-tax	(131)	421	(1,459)
Net change, Tax effect	68	(48)	218
Total other comprehensive income/(loss), after–tax	(63)	373	(1,241)
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on AFS securities:
Net change, Pre-tax	(45)	(1,066)	2,141
Net change, Tax effect	9	258	(520)
Total other comprehensive income/(loss), after–tax	$ (36)	$ (808)	$ 1,621

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