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Supplemental Cash Flow Information
 9 Months Ended
Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
 
 
Nine Months Ended September 30,
(In millions)
 
2018
 
2017
Net cash used in operating activities:
 
 
 
 
Interest paid, net of amounts capitalized
 
$
(187
)
 
$
(269
)
Income taxes paid to taxing authorities
 
(298
)
 
(101
)
Noncash investing activities, related to continuing operations:
 
 

 
 

Increase (decrease) in asset retirement costs
 
$
12

 
$
(94
)
Asset retirement obligations assumed by buyer
 
82

 
14

Notes receivable for disposal of assets
 
—

 
745


Other noncash investing activities include accrued capital expenditures as of September 30, 2018 and 2017 of $238 million and $361 million.