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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Summary Of Changes In Asset Retirement Obligations

 

 

Six Months Ended June 30,

 

 

 

2018

 

 

2017

 

Asset retirement obligations as of beginning of period

 

$

1,138

 

 

$

1,258

 

Liabilities incurred and assumed through acquisitions

 

 

22

 

 

 

15

 

Liabilities settled and divested

 

 

(64

)

 

 

(26

)

Revision of estimated obligation

 

 

23

 

 

 

(184

)

Accretion expense on discounted obligation

 

 

30

 

 

 

31

 

Foreign currency translation adjustment

 

 

(22

)

 

 

14

 

Asset retirement obligations as of end of period

 

 

1,127

 

 

 

1,108

 

Less current portion

 

 

39

 

 

 

44

 

Asset retirement obligations, long-term

 

$

1,088

 

 

$

1,064