Accumulated Other Comprehensive Income/(Loss) - Components of Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	$ (15,998)	$ 1,805	$ (20,232)	$ 6,989
Net change, Tax effect	3,871	(440)	4,702	(411)
Total other comprehensive income/(loss), after–tax	(12,127)	1,365	(15,530)	6,578
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(11,085)	2,095	(14,164)	3,014
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	2,695	(506)	3,442	(729)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(8,390)	1,589	(10,722)	2,285
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	658	(105)	989	(14)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(161)	25	(241)	3
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	497	(80)	748	(11)
Net change, Pre-tax	(10,427)	1,990	(13,175)	3,000
Net change, Tax effect	2,534	(481)	3,201	(726)
Total other comprehensive income/(loss), after–tax	(7,893)	1,509	(9,974)	2,274
Translation adjustments
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(236)	(242)	(1,355)	6,200
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	42	54	124	(224)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(194)	(188)	(1,231)	5,976
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	217	232	1,339	(6,115)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(52)	(56)	(325)	1,484
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	165	176	1,014	(4,631)
Net change, Pre-tax	(19)	(10)	(16)	85
Net change, Tax effect	(10)	(2)	(201)	1,260
Total other comprehensive income/(loss), after–tax	(29)	(12)	(217)	1,345
Fair value hedges, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	32	49	75	76
Net change, Tax effect	(8)	(12)	(19)	(19)
Total other comprehensive income/(loss), after–tax	24	37	56	57
Cash flow hedges
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(6,323)	(264)	(9,598)	2,745
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	1,538	64	2,334	(663)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(4,785)	(200)	(7,264)	2,082
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	496	678	1,328	1,891
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(121)	(164)	(323)	(456)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	375	514	1,005	1,435
Net change, Pre-tax	(5,827)	414	(8,270)	4,636
Net change, Tax effect	1,417	(100)	2,011	(1,119)
Total other comprehensive income/(loss), after–tax	(4,410)	314	(6,259)	3,517
Defined benefit pension and OPEB plans, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	240	7	298	(48)
Net change, Tax effect	(61)	(3)	(78)	8
Total other comprehensive income/(loss), after–tax	179	4	220	(40)
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	3	(645)	856	(760)
Net change, Tax effect	(1)	158	(212)	185
Total other comprehensive income/(loss), after–tax	$ 2	$ (487)	$ 644	$ (575)

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