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Accrued Expenses and Other Long-Term Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Accrued Liabilities and Other Liabilities [Abstract]  
Accrued expenses and other long-term liabilities
Accrued expenses and other long-term liabilities consisted of the following (in millions):
 
Accrued
Expenses
 
Other Long-Term
Liabilities
 
December 31,
 
December 31,
 
2018
 
2017
 
2018
 
2017
Defined benefit plan liabilities (see Note 13)
$
43

 
$
33

 
$
654

 
$
776

Wage and other employee-related liabilities
302

 
278

 
109

 
111

Uncertain income tax position liabilities (see Note 15)

 

 
721

 
723

Repatriation tax liability (see Note 15) (a)

 

 
603

 
597

Environmental liabilities (see Note 10)
29

 
30

 
327

 
232

Environmental credit obligations (see Note 19)
34

 
152

 

 

Accrued interest expense
93

 
105

 

 

Other accrued liabilities
129

 
114

 
453

 
290

Accrued expenses and other long-term liabilities
$
630

 
$
712

 
$
2,867

 
$
2,729


__________________________ 
(a)
The current portion of repatriation tax liability is included in income taxes payable. There was no current portion of repatriation tax liability as of December 31, 2018 and $114 million as of December 31, 2017.