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Asset Retirement Obligations (Notes)
3 Months Ended
Mar. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
ASSET RETIREMENT OBLIGATIONS

A reconciliation of the asset retirement obligations for the three months ended March 31, 2014 follows:
 
(In millions)
Asset retirement obligations at December 31, 2013
$
1,827

Accretion
28

Liabilities incurred
4

Revision in estimated cash flows
(5
)
Asset retirement obligations at March 31, 2014
$
1,854