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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Salaries and incentives $ 265 $ 379
Accrued benefits and payroll taxes 71 98
Trade accounts payable and other accrued liabilities 776 512
Accrued interest payable 70 89
Taxes other than income tax 59 62
Capco acquisition related liabilities 0 6
Total accounts payable and accrued liabilities $ 1,241 $ 1,146