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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Summary Of Changes In Asset Retirement Obligations

 

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

Asset retirement obligations as of beginning of period

 

$

1,272

 

 

$

1,414

 

Liabilities incurred and assumed through acquisitions

 

 

40

 

 

 

27

 

Liabilities settled and divested

 

 

(68

)

 

 

(324

)

Revision of estimated obligation

 

 

(184

)

 

 

66

 

Accretion expense on discounted obligation

 

 

62

 

 

 

75

 

Foreign currency translation adjustment

 

 

30

 

 

 

14

 

Asset retirement obligations as of end of period

 

 

1,152

 

 

 

1,272

 

Less current portion

 

 

39

 

 

 

46

 

Asset retirement obligations, long-term

 

$

1,113

 

 

$

1,226