Derivative Instruments - Effect of Fair Value and Cash Flow Hedge Accounting on Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 8,086	$ 7,754	$ 23,835	$ 22,244
Interest Expense	3,951	3,518	11,692	8,959
Losses recognized in earnings related discontinuance of cash flow hedges	7	7	21	25
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	1,113	(431)	666	(589)
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	303	(359)	315	(232)
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	(1,108)	428	(663)	584
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	(302)	359	(314)	230
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	(70)	(21)	(185)	(21)
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	$ (7)	$ (7)	$ (21)	$ (25)

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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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from discontinuance of cash flow hedge included in assessment of hedge effectiveness.

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