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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Trade accounts payable $ 107 $ 127
Client deposits 597 564
Settlement obligations 491 480
Accrued compensation and benefits 133 199
Current operating lease liabilities 74  
Other accrued expenses 283 256
Total $ 1,685 $ 1,626