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Securities - Pledged assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Pledged Assets [Line Items]    
Total assets $ 455,312 $ 416,064
Securities 149,528 136,627
Loans 75,195 71,570
Trading assets 13,625 13,981
Interest-bearing deposits with banks 11,027 9,612
Pledged assets permitted to be sold or repledged 366,000 300,000
Market value of securities received as collateral that have been sold or repledged 326,000 264,000
Cash segregated under federal or other regulations 3,000 1,000
Securities segregated under federal or other regulations 3,000 5,000
Asset Pledged as Collateral    
Pledged Assets [Line Items]    
Total assets 141,000 138,000
Securities 119,000 117,000
Loans 15,000 15,000
Trading assets 6,000 5,000
Interest-bearing deposits with banks 1,000 1,000
Financial instruments, owned, at fair value 24,000 23,000
Asset Pledged as Collateral | Federal Home Loan Bank Advances    
Pledged Assets [Line Items]    
Total assets 10,000 10,000
Asset Pledged as Collateral | Federal Reserve Discount Window Borrowings    
Pledged Assets [Line Items]    
Total assets $ 86,000 $ 88,000