Allowance for Credit Losses - Allowance for Credit Losses and Liability for Off-balance Sheet Credit Exposures (Details) - USD ($)	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Credit Loss [Abstract]
Loans	$ 591,000,000	[1]	$ 584,000,000	[1]	$ 447,000,000	$ 1,015,000,000
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	591,000,000		584,000,000
Liability for off-balance sheet credit exposures	$ 111,000,000		$ 117,000,000		$ 103,000,000	$ 237,000,000

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2023 and 2022. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20232022(in millions)AssetsLoans, net$— $162 Other assets23 44 Total assets$23 $206 LiabilitiesInterest, taxes and other liabilities$17 $22 Total liabilities$17 $22