Derivative Instruments - Effect of Fair Value and Cash Flow Hedge Accounting on Consolidated Statement of Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Interest income	$ 31,666	$ 30,007	$ 17,945
Interest expense	$ 15,377	$ 12,611	$ 3,217
OCI, Cash Flow Hedge, Reclassification for Discontinuance, Statement of Income or Comprehensive Income [Extensible Enumeration]	Changes in unrealized gains (losses)	Changes in unrealized gains (losses)	Changes in unrealized gains (losses)
Losses recognized recognized in earnings, discontinuance of cash flow hedges	$ 28	$ 28	$ 36
Asset and liability management positions \| Fair value hedges \| Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, fair value hedged item	(508)	427	(139)
Asset and liability management positions \| Fair value hedges \| Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, fair value hedged item	98	(461)	486
Asset and liability management positions \| Fair value hedges \| Interest rate contracts \| Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, fair value hedging instruments	508	(430)	138
Asset and liability management positions \| Fair value hedges \| Interest rate contracts \| Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, fair value hedging instruments	(95)	458	(482)
Asset and liability management positions \| Cash flow hedges \| Interest rate contracts \| Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, cash flow hedging instruments	(230)	(52)	0
Asset and liability management positions \| Cash flow hedges \| Interest rate contracts \| Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, cash flow hedging instruments	$ (28)	$ (28)	$ 0

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Indicates line item in statement of income or comprehensive income that includes reclassification from accumulated other comprehensive income (AOCI) for gain (loss) recognized in other comprehensive income (OCI) from discontinuance of cash flow hedge included in assessment of hedge effectiveness.

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