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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 7,604	$ 7,985	$ 15,120	$ 15,749
Interest Expense	3,553	3,962	6,977	7,741
Losses recognized in earnings related discontinuance of cash flow hedges	7	14	7	14
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	286	22	733	(447)
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	(76)	69	(188)	12
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	(285)	(23)	(733)	445
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	78	(69)	184	(12)
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	(59)	(73)	(112)	(115)
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)	$ (14)	$ (14)

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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