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Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Trade accounts payable $ 392 $ 127
Client deposits 650 564
Accrued compensation and benefits 378 199
Accrued taxes 137 18
Accrued interest 224 35
Other accrued expenses 1,299 203
Total $ 3,080 $ 1,146