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Accounts Payable and Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Accounts Payable and Accrued Liabilities, Current [Abstract]  
Accounts payable and accrued liabilities
Accounts payable and accrued liabilities as of December 31, 2018 and 2017 consists of the following (in millions):
 
2018
 
2017
Salaries and incentives
$
218

 
$
265

Accrued benefits and payroll taxes
66

 
71

Trade accounts payable and other accrued liabilities
687

 
776

Accrued interest payable
71

 
70

Taxes other than income tax
57

 
59

Total accounts payable and accrued liabilities
$
1,099

 
$
1,241