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Fair Values of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Gain (loss) to changes in debit valuation adjustments	$ (15)	$ (5)	$ (9)	$ (3)
Carrying value of unfunded commitments, deferred non-yield related loan fees and standby letters of credit	370		370		$ 377
Other guarantees carrying value	199		$ 199		$ 187
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			1911.00%
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	3	$ (2)	6
Time Deposits \| Level 2 \| Income Statement Location [Axis]: us-gaap:InterestExpenseOperating
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net gains (losses) where the fair value option is elected		(2)		1
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	$ 19	$ 3	48	2
Gain (loss) to changes in debit valuation adjustments			$ (9)	$ (3)