Trading Assets and Liabilities - Summary (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	$ 23,604	$ 22,757
Trading liabilities	3,150	2,355
U.S. Treasury
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	4,116	3,791
U.S. Government agency issued or guaranteed
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	1	2
U.S. Government sponsored enterprises
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	893	1,347
Foreign bonds
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	1,445	914
Equity securities
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	14,654	15,141
Precious metals
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	1,471	196
Trading liabilities	937	86
Precious metals | Reclassification
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	1,200
Trading liabilities	800
Securities sold, not yet purchased
Debt and Equity Securities, FV-NI [Line Items]
Trading liabilities	1,115	1,438
Derivatives, net
Debt and Equity Securities, FV-NI [Line Items]
Trading assets	1,024	1,366
Trading liabilities	$ 1,098	$ 831