Loans - Components of Loans (Details) - USD ($) $ in Millions		Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	[1]	$ 64,503	$ 62,753
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		41,870	41,051
Commercial loans | Real estate, including construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		6,241	6,612
Commercial loans | Business and corporate banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		25,802	25,426
Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		9,827	9,013
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		22,633	21,702
Consumer loans | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		21,994	21,035
Consumer loans | Home equity mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		388	393
Consumer loans | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		175	195
Consumer loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		76	79
Consumer loans | Student loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, designated under fair value option		9	11
Affiliates | Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		6,417	5,449
Other | Commercial loans | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		$ 3,410	$ 3,564

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2025 and December 31, 2024. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. September 30, 2025December 31, 2024(in millions)AssetsOther assets$7 $11 Total assets$7 $11 LiabilitiesInterest, taxes and other liabilities$14 $4 Total liabilities$14 $4