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	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Net  derivative liabilities
Beginning balance	$ (18)	$ (20)	$ (15)	$ (23)
Total net gains (losses) included in net income	0	0	(5)	0
Purchases		0		0
Sales	0	0	0	0
Settlements	5	2	7	5
Net transfers into (out of) Level 3	0	0	0	0
Ending balance	(13)	(18)	(13)	(18)
Net unrealized gains (losses) included in net income	0	0	(5)	0
SBA interest-only strips
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	22	19	23	13
Total net gains (losses) included in net income	(2)	(1)	(4)	(2)
Purchases		0		0
Sales	0	(8)	(3)	(10)
Settlements	0	0	0	0
Net transfers into (out of) Level 3	7	6	11	15
Ending balance	27	16	27	16
Net unrealized gains (losses) included in net income	(1)	0	(2)	(1)
Loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	13	14	16	26
Total net gains (losses) included in net income	0	0	0	0
Purchases		1		2
Sales	(1)	0	(5)	(13)
Settlements	0	(1)	0	(1)
Net transfers into (out of) Level 3	0	1	1	1
Ending balance	12	15	12	15
Net unrealized gains (losses) included in net income	$ 0	$ 0	$ 0	$ 0