Accumulated Other Comprehensive Income/(Loss) - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 292,332.0
Net change	2,923.0	$ (9,483.0)
Ending balance	303,082.0	285,899.0
Accumulated other comprehensive income/(loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(17,341.0)	(84.0)
Net change	2,923.0	(9,483.0)
Ending balance	(14,418.0)	(9,567.0)
Unrealized gains/(losses) on investment securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(9,124.0)	2,640.0
Net change	2,212.0	(7,453.0)
Ending balance	(6,912.0)	(4,813.0)
After-tax unrealized gains/ (losses) related to HTM securities that have been transferred to AFS	(29.1)
After-tax unamortized unrealized gains/(losses) related to transfer of AFS securities to HTM	(1,300.0)	2,200.0
Translation adjustments, net of hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,545.0)	(934.0)
Net change	197.0	(62.0)
Ending balance	(1,348.0)	(996.0)
Fair value hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(33.0)	(131.0)
Net change	(21.0)	110.0
Ending balance	(54.0)	(21.0)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(5,656.0)	(296.0)
Net change	798.0	(2,791.0)
Ending balance	(4,858.0)	(3,087.0)
Defined benefit pension and OPEB plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,451.0)	(210.0)
Net change	(55.0)	67.0
Ending balance	(1,506.0)	(143.0)
DVA on fair value option elected liabilities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	468.0	(1,153.0)
Net change	(208.0)	646.0
Ending balance	$ 260.0	$ (507.0)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount, after tax, of adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity).

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- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount, after tax and before adjustment, of unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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