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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014, and 2013, along with the additions, reductions and accretion related to the Company's ARO obligations for the year ended December 31, 2014:
 
(In millions)
Balance as of December 31, 2013
$
629

Revisions in estimates for current obligations
(8
)
Additions
15

Additions for acquisitions
95

Spending for current obligations
(7
)
Accretion — Expense
23

Accretion — Nuclear decommissioning
16

Balance as of December 31, 2014
$
763