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Commitments - Extensions of Credit (Details) - USD ($)
$ in Billions
Mar. 31, 2025
Dec. 31, 2024
Extended lines of credit    
Other Commitments [Line Items]    
Unused amounts in lines of credit to third-party entities and commitments for future financing to clients $ 1.9 $ 1.6
Financing for client purchase agreements    
Other Commitments [Line Items]    
Unused amounts in lines of credit to third-party entities and commitments for future financing to clients $ 2.1 $ 2.2