Fair Value Disclosures - Measured on a Nonrecurring Basis (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure		$ 12		$ 13
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure		12		13
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure		0		0
LHFS | Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value:		3		4
Valuation adjustments:		(68)	$ (16)
LHFS | Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value:		60		0
Loans and Leases | Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value:	[1]	293		525
Valuation adjustments:		(420)	(557)
Loans Receivable, Fair Value Disclosure		485		682
Other | Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value:		103		$ 147
Valuation adjustments:		$ (148)	$ (166)

[1] Total loans and leases measured at fair value on a nonrecurring basis still held as of period end were $485 million and $682 million at June 30, 2025 and December 31, 2024, respectively.