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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer $ 1,939 $ 1,572 $ 3,904 $ 2,813
Intersegment revenue 0 0 0 0
Operating revenues 1,939 1,572 3,904 2,813
Commodity Margin 632 [1] 533 [1] 1,277 [2] 994 [2]
Add: Mark-to-market commodity activity, net and other 173 [3] 39 [3] 136 [4] (2) [4]
Plant operating expense 274 257 539 484
Depreciation and amortization expense 147 145 300 291
Sales, general and other administrative expense 38 36 71 69
Other operating expenses 21 20 43 38
(Income) loss from unconsolidated investments in power plants (4) (8) (13) (16)
Income from operations 329 122 473 126
Interest expense, net of interest income 167 169 332 343
Debt extinguishment costs and other (income) expense, net 6 71 17 76
Income (loss) before income taxes 156 (118) 124 (293)
Commodity Margin for Six Southeast Power Plants Sold 42 32 81 57
Lease levelization (27) (11) (56) (27)
Contract amortization 3 3 7 7
West [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 487 479 978 862
Intersegment revenue 1 0 3 1
Operating revenues 488 479 981 863
Commodity Margin 228 [1] 198 [1] 430 [2] 400 [2]
Add: Mark-to-market commodity activity, net and other 21 [3] 19 [3] 50 [4] (18) [4]
Plant operating expense 95 92 200 187
Depreciation and amortization expense 58 53 118 106
Sales, general and other administrative expense 7 8 17 15
Other operating expenses 15 12 27 21
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Income from operations 74 52 118 53
Texas [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 960 571 1,607 978
Intersegment revenue 3 (25) 15 (18)
Operating revenues 963 546 1,622 960
Commodity Margin 177 [1] 133 [1] 298 [2] 209 [2]
Add: Mark-to-market commodity activity, net and other 184 [3] 34 [3] 138 [4] 23 [4]
Plant operating expense 83 93 173 158
Depreciation and amortization expense 48 42 90 84
Sales, general and other administrative expense 18 16 30 30
Other operating expenses 1 1 3 2
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Income from operations 211 15 140 (42)
North [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 332 348 971 654
Intersegment revenue 12 8 27 15
Operating revenues 344 356 998 669
Commodity Margin 175 [1] 159 [1] 442 [2] 301 [2]
Add: Mark-to-market commodity activity, net and other (23) [3] (12) [3] (40) [4] (5) [4]
Plant operating expense 65 46 117 89
Depreciation and amortization expense 32 32 65 65
Sales, general and other administrative expense 6 6 12 12
Other operating expenses 8 7 14 14
(Income) loss from unconsolidated investments in power plants (4) (8) (13) (16)
Income from operations 45 64 207 132
Southeast [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 160 174 348 319
Intersegment revenue 57 71 138 104
Operating revenues 217 245 486 423
Commodity Margin 52 [1] 43 [1] 107 [2] 84 [2]
Add: Mark-to-market commodity activity, net and other (1) [3] 7 [3] 5 [4] 14 [4]
Plant operating expense 38 34 65 65
Depreciation and amortization expense 8 18 26 37
Sales, general and other administrative expense 6 6 12 12
Other operating expenses 1 1 2 2
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Income from operations (2) (9) 7 (18)
Intersegment Elimination [Member]
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue from External Customer 0 0 0 0
Intersegment revenue (73) (54) (183) (102)
Operating revenues (73) (54) (183) (102)
Commodity Margin 0 [1] 0 [1] 0 [2] 0 [2]
Add: Mark-to-market commodity activity, net and other (8) [3] (9) [3] (17) [4] (16) [4]
Plant operating expense (7) (8) (16) (15)
Depreciation and amortization expense 1 0 1 (1)
Sales, general and other administrative expense 1 0 0 0
Other operating expenses (4) (1) (3) (1)
(Income) loss from unconsolidated investments in power plants 0 0 0 0
Income from operations $ 1 $ 0 $ 1 $ 1
[1] Our Southeast segment includes Commodity Margin of $42 million and $32 million for the three months ended June 30, 2014 and 2013, respectively, related to the six power plants in our Southeast segment that were sold in July 2014.
[2] Our Southeast segment includes Commodity Margin of $81 million and $57 million for the six months ended June 30, 2014 and 2013, respectively, related to the six power plants in our Southeast segment that were sold in July 2014.
[3] Includes $(27) million and $(11) million of lease levelization and $3 million and $3 million of amortization expense for the three months ended June 30, 2014 and 2013, respectively.
[4] Includes $(56) million and $(27) million of lease levelization and $7 million and $7 million of amortization expense for the six months ended June 30, 2014 and 2013, respectively.