Fair Value of Assets and Liabilities - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value (Details) - Level 3 - Recurring - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ (15)	$ (23)	$ (27)
Total net gains (losses) included in net income	(25)	(15)	(15)
Purchases	0	0	0
Sales	0	0	0
Settlements	15	23	19
Net transfers into (out of) Level 3	0	0	0
Ending balance	(25)	(15)	(23)
Net unrealized gains (losses) included in net income	$ (25)	$ (15)	$ (15)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expense	Other expense	Other expense
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expense	Other expense	Other expense
SBA interest-only strips
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 23	$ 13	$ 25
Total net gains (losses) included in net income	(6)	(5)	(12)
Purchases	0	0	0
Sales	(11)	(17)	(54)
Settlements	0	0	0
Net transfers into (out of) Level 3	39	32	54
Ending balance	45	23	13
Net unrealized gains (losses) included in net income	(2)	(2)	(1)
Loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	16	26	22
Total net gains (losses) included in net income	1	1	4
Purchases	2	2	3
Sales	(5)	(13)	(3)
Settlements	(1)	(2)	(2)
Net transfers into (out of) Level 3	1	2	2
Ending balance	14	16	26
Net unrealized gains (losses) included in net income	$ 1	$ 1	$ 4