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Component: (Network and Table)
Network
2413402 - Disclosure - Asset Retirement Obligations (Details)
(http://www.nrgenergy.com/role/AssetRetirementObligationsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001013871 (http://www.sec.gov/CIK)
Asset Retirement Obligation Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Asset Retirement Obligation Disclosure [Abstract]
 
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
 
Balance at the beginning of the period
945,000,000  
Asset Retirement Obligation, Revision of Estimate
(103,000,000) 
Additions
49,000,000  
Spending for current obligations
(8,000,000) 
Accretion — Expense
42,000,000  
Accretion — Nuclear decommissioning
15,000,000  
Balance at the ending of the period
940,000,000