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Fair Values of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 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	$ 416		$ 416		$ 489
Other guarantees carrying value	184		$ 184		$ 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			297.00%
Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Credit valuation adjustment as percentage of derivative contract fair value			1.00%
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)	$ (30)	$ (4)	$ (33)
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		$ 11