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Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]  
Details of supplemental disclosures of cash flow and non-cash investing and financing information
Detail of supplemental disclosures of cash flow and non-cash investing and financing information was:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In millions)
Interest paid, net of amount capitalized
$
436

 
$
543

 
$
606

Income taxes paid, net of refunds
9

 
9

 
14

Non-cash investing and financing activities:
 
 
 
 
 
Additions to fixed assets for accrued capital expenditures
20

 
19

 
9