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Fair Values of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Changes in debit valuation adjustments	$ (5)	$ 0	$ (8)	$ 0
Carrying value of unfunded commitments, deferred non-yield related loan fees and standby letters of credit	374		374		$ 376
Other guarantees carrying value	179		$ 179		$ 194
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Credit valuation adjustment as percentage of derivative contract fair value			0.00%
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Credit valuation adjustment as percentage of derivative contract fair value			248.00%
Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Credit valuation adjustment as percentage of derivative contract fair value			2.00%
Mortgage Loans Held For Sale \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net gains (losses) where the fair value option is elected	18	26	$ 24	22
Time Deposits \| Level 2 \| Interest Expense
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net gains (losses) where the fair value option is elected	(7)	$ (13)	(6)	$ (2)
Long-Term Debt, Interest Expense \| Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net gains (losses) where the fair value option is elected	$ (1)		1
Changes in debit valuation adjustments			$ (8)