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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]          
Processing, administrative, and other fees $ 5,263 $ 5,215 $ 15,909 $ 15,205  
Amounts due from unconsolidated merchant alliances 3,957   3,957   $ 3,725
Affiliated entities          
Related Party Transaction [Line Items]          
Processing, administrative, and other fees 21 $ 36 72 $ 113  
Amounts due from unconsolidated merchant alliances $ 7   $ 7   $ 21