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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]          
Processing, administrative, and other fees $ 5,107 $ 4,756 $ 9,990 $ 9,303  
Amounts due from unconsolidated merchant alliances 3,744   3,744   $ 3,582
Affiliated entities          
Related Party Transaction [Line Items]          
Processing, administrative, and other fees 37 $ 45 77 $ 91  
Amounts due from unconsolidated merchant alliances $ 31   $ 31   $ 38