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Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Trade accounts payable $ 593 $ 437
Client deposits 783 702
Accrued compensation and benefits 392 419
Accrued taxes 154 130
Accrued interest 216 220
Other accrued expenses 1,412 1,278
Total $ 3,550 $ 3,186