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Loans, Lending Commitments and Related Allowance for Credit Losses - Provision for Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]        
Loans $ 6 $ 18 $ 225 $ 81
Lending commitments $ (6) $ 61 $ 106 $ 68