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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Summary Of Changes In Asset Retirement Obligations

 

 

Six Months Ended June 30,

 

 

 

2017

 

 

2016

 

 

 

(Millions)

 

Asset retirement obligations as of beginning of period

 

$

1,272

 

 

$

1,414

 

Liabilities incurred and assumed through acquisitions

 

 

15

 

 

 

15

 

Liabilities settled and divested

 

 

(26

)

 

 

(51

)

Revision of estimated obligation

 

 

(184

)

 

 

70

 

Accretion expense on discounted obligation

 

 

31

 

 

 

39

 

Foreign currency translation adjustment

 

 

14

 

 

 

30

 

Asset retirement obligations as of end of period

 

 

1,122

 

 

 

1,517

 

Less current portion

 

 

44

 

 

 

44

 

Asset retirement obligations, long-term

 

$

1,078

 

 

$

1,473