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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
 
Year Ended December 31,
(In millions)
2018
 
2017
 
2016
Net cash used in operating activities:
 
 
 
 
 
Interest paid, net of amounts capitalized
$
(270
)
 
$
(379
)
 
$
(375
)
Income taxes paid to taxing authorities(a)
(323
)
 
(391
)
 
(84
)
Noncash investing activities, related to continuing operations:
 
 
 
 
 
Increase (decrease) asset retirement costs
$
(183
)
 
$
(202
)
 
$
110

Asset retirement obligations assumed by buyer
(82
)
 
14

 
40

Notes receivable for disposition of assets
—

 
748

 
—


(a) 2017 includes a payment of $108 million made to the U.K. tax authorities to preserve our appeal rights, see Note 25 for additional discussion.
Other noncash investing activities include accrued capital expenditures as of December 31, 2018, 2017 and 2016 of $250 million, $329 million and $155 million.