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Fair Values of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying value of unfunded commitments, deferred non-yield related loan fees and standby letters of credit	$ 399		$ 399		$ 489
Other guarantees carrying value	179		$ 179		$ 198
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			435.00%
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	26	$ (28)	$ 22	$ (61)
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	$ (13)	$ 1	$ (2)	$ 1