Accumulated Other Comprehensive Income (Loss) - Reconciliation of Accumulated 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
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 66,247	$ 60,558	$ 65,651	$ 59,040
Changes in unrealized gains (losses), Investment Securities Available-For-Sale	191	198	(143)	706
Changes in unrealized gains (losses), Derivative Hedges	(225)	157	(389)	441
Gain (loss) to changes in debit valuation adjustments	(15)	(5)	(9)	(3)
Changes in unrealized gains (losses)	(49)	350	(541)	1,144
Foreign currency translation adjustment	4	(8)	9	(4)
Reclassification to earnings of realized (gains) losses	196	244	367	414
Applicable income taxes	(39)	(153)	41	(399)
Ending Balance	67,895	61,896	67,895	61,896
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(7,223)	(9,042)	(6,987)	(9,764)
Ending Balance	(7,111)	(8,609)	(7,111)	(8,609)
Unrealized Gains (Losses) on Investment Securities Available-For-Sale
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(3,501)	(4,699)	(3,278)	(5,078)
Changes in unrealized gains (losses), Investment Securities Available-For-Sale	191	198	(143)	706
Reclassification to earnings of realized (gains) losses	49	57	84	57
Applicable income taxes	(61)	(69)	15	(198)
Ending Balance	(3,322)	(4,513)	(3,322)	(4,513)
Unrealized Gains (Losses) on Investment Securities Transferred From Available-For-Sale to Held-To-Maturity
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(2,741)	(3,082)	(2,816)	(3,165)
Reclassification to earnings of realized (gains) losses	113	123	214	234
Applicable income taxes	(28)	(33)	(54)	(61)
Ending Balance	(2,656)	(2,992)	(2,656)	(2,992)
Unrealized Gains (Losses) on Derivative Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(160)	(297)	(69)	(553)
Changes in unrealized gains (losses), Derivative Hedges	(225)	157	(389)	441
Reclassification to earnings of realized (gains) losses	41	66	83	126
Applicable income taxes	46	(58)	77	(146)
Ending Balance	(298)	(132)	(298)	(132)
Unrealized Gains (Losses) on Retirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(806)	(956)	(801)	(955)
Reclassification to earnings of realized (gains) losses	(7)	(2)	(14)	(3)
Applicable income taxes	1	4	3	4
Ending Balance	(812)	(954)	(812)	(954)
Debit Valuation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(6)	2	(10)	1
Changes in unrealized gains (losses), Derivative Hedges			(9)
Gain (loss) to changes in debit valuation adjustments	(15)	(5)		(3)
Applicable income taxes	4	2	2	1
Ending Balance	(17)	(1)	(17)	(1)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(9)	(10)	(13)	(14)
Foreign currency translation adjustment	4	(8)	9	(4)
Applicable income taxes	(1)	1	(2)	1
Ending Balance	$ (6)	$ (17)	$ (6)	$ (17)

Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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