Derivative Instruments - Effect of Fair Value and Cash Flow Hedge Accounting on Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 7,516	$ 7,764
Interest Expense	3,424	3,779
Losses recognized in earnings related discontinuance of cash flow hedges	7	7
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	447	(469)
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	(112)	(57)
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	(448)	468
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	106	57
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	(53)	(42)
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)

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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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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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of interest expense classified as operating.

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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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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