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Related Party Transactions (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
	Aug. 07, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Feb. 22, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Processing, administrative, and other fees		$ 4,873.0	$ 4,518.0	$ 14,176.0	$ 13,106.0
Amounts due from unconsolidated merchant alliances		3,461.0		3,461.0			$ 3,585.0
Treasury stock, common, value		11,899.0		11,899.0			8,378.0
Affiliated entities
Related Party Transaction [Line Items]
Processing, administrative, and other fees		44.0	47.0	135.0	140.0
Amounts due from unconsolidated merchant alliances		42.0		42.0			$ 43.0
Equity investments
Related Party Transaction [Line Items]
Processing, administrative, and other fees		$ 1.0	$ 5.0	$ 4.0	$ 14.0
Director | ValueAct Capital Master Fund, L.P.
Related Party Transaction [Line Items]
Purchases of treasury stock (in shares)	4.1
Shares acquired, average cost per share (in dollars per share)	$ 121.98
Treasury stock, common, value	$ 500.0
Stock repurchase program, authorized amount (in shares)						$ 75.0

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