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Component: (Network and Table)
Network
2413402 - Disclosure - Asset Retirement Obligations (Details)
(http://www.nrgenergy.com/role/AssetRetirementObligationsDetails)
TableAsset Retirement Obligation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001126294 (http://www.sec.gov/CIK)
Asset Retirement Obligations [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
Legal Entity [Axis]
GenOn Americas Generation, LLC [Member]GenOn Mid-Atlantic, LLC [Member]Entity [Domain]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
 
 
 
Balance at the beginning of the period
82,000,000  
27,000,000  
187,000,000  
Asset Retirement Obligation, Liabilities Incurred
16,000,000  
0  
16,000,000  
Asset Retirement Obligation, Revision of Estimate
(10,000,000) 
10,000,000  
(13,000,000) 
Asset Retirement Obligation, Liabilities Settled
(1,000,000) 
0  
(6,000,000) 
Accretion Expense
13,000,000  
2,000,000  
21,000,000  
Balance at the end of the period
100,000,000  
 
39,000,000  
 
205,000,000