Derivative Instruments - Effect of Fair Value and Cash Flow Hedge Accounting on Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 7,985	$ 7,526	$ 15,749	$ 14,490
Interest Expense	3,962	3,111	7,741	5,441
Losses recognized in earnings related discontinuance of cash flow hedges	7	11	14	18
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	22	(332)	(447)	(158)
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	69	241	12	127
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	(23)	334	445	156
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	(69)	(243)	(12)	(129)
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	(73)	0	(115)	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	$ (7)	$ (11)	$ (14)	$ (18)

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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