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Asset Retirement Obligations (Notes)
 9 Months Ended
Sep. 30, 2013
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations
ASSET RETIREMENT OBLIGATIONS

A reconciliation of the asset retirement obligations for the nine months ended September 30, 2013 follows:
 
(In millions)
Asset retirement obligations at December 31, 2012
$
1,719

Accretion
79

Liabilities incurred
1

Liabilities settled
(12
)
Revision in estimated cash flows
13

Asset retirement obligations at September 30, 2013
$
1,800