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Segment and Significant Customer Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer $ 1,572 $ 879 $ 2,813 $ 2,115
Intersegment revenue 0 0 0 0
Operating revenues 1,572 879 2,813 2,115
Commodity Margin 533 609 [1],[2] 994 1,126 [1],[2]
Add: Mark-to-market commodity activity, net and other 39 [3] (344) [3] (2) [4] (260) [4]
Plant operating expense 257 271 484 492
Depreciation and amortization expense 145 138 291 278
Sales, general and other administrative expense 36 35 69 68
Other operating expenses 20 19 38 40
(Income) loss from unconsolidated investments in power plants (8) (5) (16) (14)
Income (loss) from operations 122 (193) 126 2
Interest expense, net of interest income 169 182 343 364
Loss on interest rate derivatives 0 0 0 14
Debt Extinguishment Costs and Other (Income) Expense, Net 71 6 76 20
Income (loss) before income taxes (118) (381) (293) (396)
Lease levelization (11) (1) (27) (9)
Commodity Margin Riverside Energy Center   24   32
Commodity Margin Broad River Energy Center   13   24
Contract amortization 3 3 7 7
West [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 479 258 862 674
Intersegment revenue 0 1 1 5
Operating revenues 479 259 863 679
Commodity Margin 198 210 [1],[2] 400 418 [1],[2]
Add: Mark-to-market commodity activity, net and other 19 [3] (76) [3] (18) [4] (40) [4]
Plant operating expense 88 112 181 193
Depreciation and amortization expense 52 49 103 99
Sales, general and other administrative expense 3 6 7 14
Other operating expenses 11 9 20 20
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Income (loss) from operations 63 (42) 71 52
Texas [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 571 188 978 544
Intersegment revenue (25) 41 (18) 61
Operating revenues 546 229 960 605
Commodity Margin 133 145 [1],[2] 209 254 [1],[2]
Add: Mark-to-market commodity activity, net and other 34 [3] (217) [3] 23 [4] (183) [4]
Plant operating expense 96 72 164 140
Depreciation and amortization expense 44 34 87 69
Sales, general and other administrative expense 21 13 38 24
Other operating expenses 1 1 2 3
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Income (loss) from operations 5 (192) (59) (165)
North [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 348 269 654 567
Intersegment revenue 8 2 15 5
Operating revenues 356 271 669 572
Commodity Margin 159 181 [1],[2] 301 325 [1],[2]
Add: Mark-to-market commodity activity, net and other (12) [3] (3) [3] (5) [4] 9 [4]
Plant operating expense 46 58 90 103
Depreciation and amortization expense 32 34 65 67
Sales, general and other administrative expense 6 8 12 14
Other operating expenses 7 6 14 15
(Income) loss from unconsolidated investments in power plants (8) (5) (16) (14)
Income (loss) from operations 64 77 131 149
Southeast [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 174 164 319 330
Intersegment revenue 71 (6) 104 16
Operating revenues 245 158 423 346
Commodity Margin 43 73 [1],[2] 84 129 [1],[2]
Add: Mark-to-market commodity activity, net and other 7 [3] (42) [3] 14 [4] (32) [4]
Plant operating expense 35 36 65 69
Depreciation and amortization expense 18 22 37 45
Sales, general and other administrative expense 7 7 12 15
Other operating expenses (1) 2 1 3
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Income (loss) from operations (9) (36) (17) (35)
Consolidation and Elimination [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 0 0 0 0
Intersegment revenue (54) (38) (102) (87)
Operating revenues (54) (38) (102) (87)
Commodity Margin 0 0 [1],[2] 0 0 [1],[2]
Add: Mark-to-market commodity activity, net and other (9) [3] (6) [3] (16) [4] (14) [4]
Plant operating expense (8) (7) (16) (13)
Depreciation and amortization expense (1) (1) (1) (2)
Sales, general and other administrative expense (1) 1 0 1
Other operating expenses 2 1 1 (1)
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Income (loss) from operations $ (1) $ 0 $ 0 $ 1
[1] Our Southeast segment includes Commodity Margin of $13 million and $24 million for the three and six months ended June 30, 2012 related to Broad River, which was sold in December 2012.
[2] Our North segment includes Commodity Margin of $24 million and $32 million for the three and six months ended June 30, 2012 related to Riverside Energy Center, LLC, which was sold in December 2012.
[3] Includes $(11) million and $(1) million of lease levelization and $3 million and $3 million of amortization expense for the three months ended June 30, 2013 and 2012, respectively
[4] Includes $(27) million and $(9) million of lease levelization and $7 million and $7 million of amortization expense for the six months ended June 30, 2013 and 2012, respectively.