Restricted Cash, Other Restricted Assets and Intercompany Funds Transfers - Components (Details) - USD ($) $ in Billions	Dec. 31, 2025	Dec. 31, 2024
Restricted Cash and Cash Equivalent Item [Line Items]
Total restricted cash	$ 29.0	$ 27.5
Deposits with banks
Restricted Cash and Cash Equivalent Item [Line Items]
Total restricted cash	27.8	26.1
Cash and due from banks
Restricted Cash and Cash Equivalent Item [Line Items]
Total restricted cash	1.2	1.4
Segregated for the benefit of securities and cleared derivative customers
Restricted Cash and Cash Equivalent Item [Line Items]
Total restricted cash	19.4	18.7
Cash reserves at non-U.S. central banks and held for other general purposes
Restricted Cash and Cash Equivalent Item [Line Items]
Total restricted cash	$ 9.6	$ 8.8