Allowance for Credit Losses - Allowance for Credit Losses and Liability for Off-balance Sheet Credit Exposures (Details) - USD ($)	Jun. 30, 2023		Mar. 31, 2023	Dec. 31, 2022		Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Credit Loss [Abstract]
Loans	$ 605,000,000	[1]	$ 588,000,000	$ 584,000,000	[1]	$ 534,000,000	$ 467,000,000	$ 447,000,000
Securities held-to-maturity	0			0
Other financial assets measured at amortized cost	0			0
Securities available-for-sale	0			0
Total allowance for credit losses	605,000,000			584,000,000
Liability for off-balance sheet credit exposures	$ 143,000,000		$ 125,000,000	$ 117,000,000		$ 89,000,000	$ 84,000,000	$ 103,000,000

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 30, 2023 and December 31, 2022. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. June 30, 2023December 31, 2022(in millions)AssetsLoans, net$186 $162 Other assets40 44 Total assets$226 $206 LiabilitiesInterest, taxes and other liabilities$35 $22 Total liabilities$35 $22