Fair Value - Schedule of Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities (Details) - Fair value, measurements, recurring - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative liabilities, net of derivative assets
Liabilities
Fair value at beginning of the period	$ 3	$ 8
Fair value at January 1,
Included in earnings	(1)	(4)
Included in OCI	0	0
Purchases and originations	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	2	4
Fair value at ending of the period	4	8
Net unrealized gains still held at March 31,
Included in earnings	0	(2)
Included in OCI	0	0
Equity securities
Assets
Fair value at beginning of the period	0	1
Net realized/unrealized gains
Included in earnings	0	0
Included in OCI	0	0
Purchases and originations	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(1)
Fair value at ending of the period	0	0
Net unrealized gains still held at March 31,
Included in earnings	0	0
Included in OCI	0	0
Available-for-sale securities
Assets
Fair value at beginning of the period	35	9
Net realized/unrealized gains
Included in earnings	0	0
Included in OCI	0	0
Purchases and originations	0	2
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at ending of the period	35	11
Net unrealized gains still held at March 31,
Included in earnings	0	0
Included in OCI	0	0
Loans held-for-sale
Assets
Fair value at beginning of the period	5	0
Net realized/unrealized gains
Included in earnings	0	0
Included in OCI	0	0
Purchases and originations	8	0
Sales	(10)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at ending of the period	3	0
Net unrealized gains still held at March 31,
Included in earnings	0	0
Included in OCI	$ 0	$ 0