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Segment and Significant Customer Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues from external customers $ 879 $ 1,633 $ 2,115 $ 3,132
Intersegment revenues 0 0 0 0
Total operating revenues 879 1,633 2,115 3,132
Commodity Margin 609 607 1,126 1,096
Add: Mark-to-market commodity activity, net and other (344) [1],[2] 24 [1],[2] (260) [1],[3] (37) [1],[3]
Plant operating expense 271 261 492 499
Depreciation and amortization expense 138 131 278 262
Sales, general and other administrative expense 35 34 68 66
Other operating expenses 19 [4] 20 [4] 40 [4] 38 [4]
(Income) loss from unconsolidated investments in power plants (5) 2 (14) (7)
Operating Income (Loss) (193) 183 2 201
Interest expense, net of interest income 182 190 364 378
Loss on interest rate derivatives 0 (37) (14) (146)
Debt Extinguishment Costs and Other (Income) Expense, Net 6 8 20 108
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest (381) (52) (396) (431)
Lease levelization (1) 4 (9) 4
Contract amortization 3 1 7 1
RGGI compliance and other environmental costs 2 2 5 4
Commodity Margin Riverside Energy Center 24 22 32 31
West [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues from external customers 258 466 674 1,065
Intersegment revenues 1 1 5 4
Total operating revenues 259 467 679 1,069
Commodity Margin 210 236 418 469
Add: Mark-to-market commodity activity, net and other (76) [1],[2] 11 [1],[2] (40) [1],[3] 16 [1],[3]
Plant operating expense 112 116 193 203
Depreciation and amortization expense 49 42 99 88
Sales, general and other administrative expense 6 8 14 19
Other operating expenses 9 [4] 11 [4] 20 [4] 19 [4]
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Operating Income (Loss) (42) 70 52 156
Texas [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues from external customers 188 646 544 1,096
Intersegment revenues 41 5 61 10
Total operating revenues 229 651 605 1,106
Commodity Margin 145 128 254 195
Add: Mark-to-market commodity activity, net and other (217) [1],[2] 27 [1],[2] (183) [1],[3] (33) [1],[3]
Plant operating expense 72 63 140 143
Depreciation and amortization expense 34 35 69 65
Sales, general and other administrative expense 13 13 24 23
Other operating expenses 1 [4] 3 [4] 3 [4] 3 [4]
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Operating Income (Loss) (192) 41 (165) (72)
North [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues from external customers 269 324 567 595
Intersegment revenues 2 5 5 13
Total operating revenues 271 329 572 608
Commodity Margin 181 [5] 184 [5] 325 [5] 319 [5]
Add: Mark-to-market commodity activity, net and other (3) [1],[2] (5) [1],[2] 9 [1],[3] (1) [1],[3]
Plant operating expense 58 47 103 92
Depreciation and amortization expense 34 33 67 66
Sales, general and other administrative expense 8 6 14 12
Other operating expenses 6 [4] 9 [4] 15 [4] 16 [4]
(Income) loss from unconsolidated investments in power plants (5) 2 (14) (7)
Operating Income (Loss) 77 82 149 139
Southeast [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues from external customers 164 197 330 376
Intersegment revenues (6) 40 16 85
Total operating revenues 158 237 346 461
Commodity Margin 73 59 129 113
Add: Mark-to-market commodity activity, net and other (42) [1],[2] 0 [1],[2] (32) [1],[3] (4) [1],[3]
Plant operating expense 36 41 69 74
Depreciation and amortization expense 22 22 45 45
Sales, general and other administrative expense 7 6 15 11
Other operating expenses 2 [4] 2 [4] 3 [4] 3 [4]
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Operating Income (Loss) (36) (12) (35) (24)
Consolidation and Elimination [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues from external customers 0 0 0 0
Intersegment revenues (38) (51) (87) (112)
Total operating revenues (38) (51) (87) (112)
Commodity Margin 0 0 0 0
Add: Mark-to-market commodity activity, net and other (6) [1],[2] (9) [1],[2] (14) [1],[3] (15) [1],[3]
Plant operating expense (7) (6) (13) (13)
Depreciation and amortization expense (1) (1) (2) (2)
Sales, general and other administrative expense 1 1 1 1
Other operating expenses 1 [4] (5) [4] (1) [4] (3) [4]
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Operating Income (Loss) $ 0 $ 2 $ 1 $ 2
[1] Mark-to-market commodity activity represents the change in the unrealized portion of our mark-to-market activity, net, included in operating revenues and fuel and purchased energy expense on our Consolidated Condensed Statements of Operations
[2] Includes $(1) million and $4 million of lease levelization and $3 million and $1 million of amortization expense for the three months ended June 30, 2012 and 2011, respectively.
[3] Includes $(9) million and $4 million of lease levelization and $7 million and $1 million of amortization expense for the six months ended June 30, 2012 and 2011, respectively.
[4] Excludes $2 million of RGGI compliance and other environmental costs for both the three months ended June 30, 2012 and 2011, and $5 million and $4 million for the six months ended June 30, 2012 and 2011, respectively, which are components of Commodity Margin.
[5] Our North segment includes Commodity Margin related to Riverside Energy Center, LLC of $24 million and $22 million for three months ended June 30, 2012 and 2011, respectively, and $32 million and $31 million for the six months ended June 30, 2012 and 2011, respectively.