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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of company's ARO obligations and related additions, reductions and accretion
The following table represents the balance of ARO obligations as of December 31, 2013, and 2012, along with the additions, reductions and accretion related to the Company's ARO obligations for the year ended December 31, 2013:
 
(In millions)
Balance as of December 31, 2012
$
646

Revisions in estimates for current obligations
(77
)
Additions
29

Spending for current obligations
(5
)
Accretion — Expense
19

Accretion — Nuclear decommissioning
17

Balance as of December 31, 2013
$
629