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Commitments and Contingencies (Details) operating Leases (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Lease Commitments      
Lease expense $ 67,000,000 $ 81,000,000 $ 111,000,000
Coal, Gas and Transportation Commitments
     
Coal, Gas and Transportation Commitments      
Purchases 1,400,000,000 1,600,000,000 1,500,000,000
Dickerson Morgantown [Member]
     
Coal, Gas and Transportation Commitments      
Leased Interest 100.00%    
GenOn Mid-Atlantic
     
Future commitments under coal, gas and transportation contractual agreements      
2013 138,000,000    
2014 131,000,000    
2015 110,000,000    
2016 150,000,000    
2017 144,000,000    
Thereafter 791,000,000    
Total 1,464,000,000    
REMA
     
Future commitments under coal, gas and transportation contractual agreements      
2013 64,000,000    
2014 63,000,000    
2015 56,000,000    
2016 61,000,000    
2017 63,000,000    
Thereafter 455,000,000    
Total 762,000,000    
Other Property
     
Future commitments under coal, gas and transportation contractual agreements      
2013 88,000,000    
2014 86,000,000    
2015 80,000,000    
2016 71,000,000    
2017 69,000,000    
Thereafter 260,000,000    
Total $ 654,000,000    
Shawville
     
Coal, Gas and Transportation Commitments      
Leased Interest 100.00%    
Keystone, Shelocta, PA
     
Coal, Gas and Transportation Commitments      
Leased Interest 16.45%    
Conemaugh, New Florence, PA
     
Coal, Gas and Transportation Commitments      
Leased Interest 16.67%