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Fair Values of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Changes in debit valuation adjustments	$ 2	$ 0
Carrying value of unfunded commitments, deferred non-yield related loan fees and standby letters of credit	360		$ 376
Other guarantees carrying value	$ 191		$ 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	367.00%
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	$ 3	(1)
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	3	$ 8
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)