Derivative Instruments and Hedging Activities - Schedule of Statement of Gains and Losses on Derivative Instruments Reported in Statement of Comprehensive Income (Details) - Total derivatives not designated as accounting hedges - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	$ (5)	$ (2)	$ (5)	$ (1)
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	0	0	0	1
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	0	(2)	1	(2)
Credit
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	(1)	0	(2)	0
Equity
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	(4)	0	(4)	0
Income Statement Location [Axis]: us-gaap:GainLossOnSalesOfLoansNet \| Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	0	0	0	1
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Credit
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	(1)	0	(2)	0
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Equity
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	(4)	0	(4)	0
Income Statement Location [Axis]: us-gaap:OtherNoninterestExpense \| Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in earnings	$ 0	$ (2)	$ 1	$ (2)