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Condensed Consolidating Financial Information (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Financial Statements        
Net income $ 8 $ (55) $ 61 $ 306
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (43) (76) (132) (225)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 1 (27) (1) (5)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax (11) 0 (11) 0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 0 0 0 1
Available-for-sale Securities, net of tax, tax benefit (expense) 2 (1) 2 (2)
Other comprehensive loss (51) (104) (142) (231)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (43) (159) (81) 75
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 9 0 18 0
Comprehensive income attributable to NRG Energy, Inc. (52) (159) (99) 75
Dividends for preferred shares 2 2 7 7
Comprehensive (loss)/income available for common stockholders (54) (161) (106) 68
Guarantor Subsidiaries
        
Condensed Financial Statements        
Net income 73 79 310 185
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (43) (94) (122) (232)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0 0 0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax 0   0  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax       (1)
Available-for-sale Securities, net of tax, tax benefit (expense) 0 0 0 0
Other comprehensive loss (43) (94) (122) (231)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 30   188  
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0   0  
Comprehensive income attributable to NRG Energy, Inc. 30 (15) 188 (46)
Dividends for preferred shares 0 0 0 0
Comprehensive (loss)/income available for common stockholders 30 (15) 188 (46)
Non-Guarantor Subsidiaries
        
Condensed Financial Statements        
Net income 48 19 166 23
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (14) (11) (33) (13)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 (24) (2) (4)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax (11)   (11)  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax       0
Available-for-sale Securities, net of tax, tax benefit (expense) 0 0 0 0
Other comprehensive loss (25) (35) (46) (17)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 23   120  
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 9   18  
Comprehensive income attributable to NRG Energy, Inc. 14 (16) 102 6
Dividends for preferred shares 0 0 0 0
Comprehensive (loss)/income available for common stockholders 14 (16) 102 6
Parent Company [Member]
        
Condensed Financial Statements        
Net income (1) (55) 43 306
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (54) (100) (145) (228)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 1 (3) 1 (1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax 0   0  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax       0
Available-for-sale Securities, net of tax, tax benefit (expense) 2 (1) 2 (2)
Other comprehensive loss (51) (104) (142) (231)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (52)   (99)  
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0   0  
Comprehensive income attributable to NRG Energy, Inc. (52) (159) (99) 75
Dividends for preferred shares 2 2 7 7
Comprehensive (loss)/income available for common stockholders (54) (161) (106) 68
Eliminations
        
Condensed Financial Statements        
Net income (112) [1] (98) (458) [1] (208) [1]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 68 [1] 129 168 [1] 248
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 [1] 0 0 [1] 0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax 0 [1]   0 [1]  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax       0
Available-for-sale Securities, net of tax, tax benefit (expense) 0 [1] 0 0 [1] 0
Other comprehensive loss 68 [1] 129 [1] 168 [1] 248 [1]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (44) [1]   (290) [1]  
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 [1]   0 [1]  
Comprehensive income attributable to NRG Energy, Inc. (44) [1] 31 [1] (290) [1] 40 [1]
Dividends for preferred shares 0 [1] 0 0 [1] 0
Comprehensive (loss)/income available for common stockholders $ (44) [1] $ 31 [1] $ (290) [1] $ 40 [1]
[1] All significant intercompany transactions have been eliminated in consolidation.