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Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Trade accounts payable $ 127 $ 80
Client deposits 564 481
Settlement obligations 480 379
Accrued compensation and benefits 199 198
Other accrued expenses 256 221
Total $ 1,626 $ 1,359