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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 7,598	$ 7,604	$ 15,005	$ 15,120
Interest Expense	3,237	3,553	6,381	6,977
Losses recognized in earnings related discontinuance of cash flow hedges		7		14
Asset and Liability Management Positions \| Fair value hedges \| Income Statement Location [Axis]: us-gaap:InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, fair value hedged item	(249)	286	(460)	733
Asset and Liability Management Positions \| Fair value hedges \| Income Statement Location [Axis]: us-gaap:InterestExpenseOperating
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, fair value hedged item	(94)	(76)	(145)	(188)
Asset and Liability Management Positions \| Fair value hedges \| Interest rate contracts \| Income Statement Location [Axis]: us-gaap:InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, fair value hedging instruments	253	(285)	453	(733)
Asset and Liability Management Positions \| Fair value hedges \| Interest rate contracts \| Income Statement Location [Axis]: us-gaap:InterestExpenseOperating
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, fair value hedging instruments	93	78	143	184
Asset and Liability Management Positions \| Cash flow hedges \| Interest rate contracts \| Income Statement Location [Axis]: us-gaap:InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, cash flow hedging instruments	(41)	(59)	(82)	(112)
Asset and Liability Management Positions \| Cash flow hedges \| Interest rate contracts \| Income Statement Location [Axis]: us-gaap:InterestExpenseOperating
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in earnings, cash flow hedging instruments	$ 0	$ (7)	$ (1)	$ (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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