Loans - Components of Loans (Details) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	[1]	$ 57,945	$ 59,380
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		39,811	41,817
Commercial loans | Real estate, including construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		7,185	7,963
Commercial loans | Business and corporate banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		16,169	16,075
Commercial loans | Global banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		10,127	10,578
Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		6,330	7,201
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		18,134	17,563
Consumer loans | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		17,452	16,838
Consumer loans | Home equity mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		364	370
Consumer loans | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		197	213
Consumer loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		121	142
Consumer loans | Student loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, designated under fair value option		17	20
Affiliates | Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		3,067	3,557
Other | Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		$ 3,263	$ 3,644

[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