Loans Held for Sale - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale	[1]	$ 453		$ 339
Revenue (losses) associated with the economic hedging program		70	$ 438
Commercial loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans held-for-sale		264		250
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		453		339
Valuation allowance		0		2
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		0		0
Valuation allowance		0		0
Loans Transferred From Portfolio Loans to Held For Sale | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		189		89
Residential mortgages | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		0		0
Global banking | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for sale		453		$ 339
Other Income (Loss)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue (losses) associated with the economic hedging program		0	0
Other Income (Loss) | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lower of amortized cost or fair value (reversal)		$ 0	$ 0

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at March 31, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. March 31, 2024December 31, 2023(in millions)AssetsOther assets$21 $23 Total assets$21 $23 LiabilitiesInterest, taxes and other liabilities$28 $17 Total liabilities$28 $17