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Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Trade accounts payable $ 437 $ 392
Client deposits 702 650
Accrued compensation and benefits 419 378
Accrued taxes 130 137
Accrued interest 220 224
Other accrued expenses 1,278 1,299
Total $ 3,186 $ 3,080