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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income (loss) $ 99 $ (176)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization expense 449 [1] 431 [1]
Debt extinguishment costs 0 82
Deferred income taxes (7) (56)
(Gain) loss on sale of power plants and other, net 10 18
Unrealized mark-to-market activities, net (103) [2] 42 [2]
(Income) loss from unconsolidated investments in power projects (21) (12)
Return on investment in unconsolidated subsidiaries 20 6
Stock-based compensation expense 19 18
Other 1 5
Change in operating assets and liabilities, net of effects of acquisitions:    
Accounts receivable 96 (87)
Derivative instruments, net (114) (6)
Other assets 97 27
Accounts payable and accrued expenses (119) 95
Settlement of non-hedging interest rate swaps 156 147
Other liabilities 25 2
Net cash provided by (used in) operating activities 608 536
Cash flows from investing activities:    
Purchases of property, plant and equipment (509) (511)
Settlement of non-hedging interest rate swaps (156) (147)
Return of investment in unconsolidated investment in power plants 5 0
(Increase) decrease in restricted cash (32) 9
Purchases of deferred transmission credits (12) (16)
Other 3 5
Net cash used in investing activities (701) (660)
Cash flows from financing activities:    
Repayment of Term Loans (12) 0
Borrowings under Term Loan and New Term Loan 0 1,657
Repayments on NDH Project Debt 0 (1,283)
Issuance of First Lien Notes 0 1,200
Repayments on First Lien Credit Facility 0 (1,191)
Borrowings from project financing, notes payable and other 312 223
Repayments of project financing, notes payable and other (53) (476)
Capital contributions from noncontrolling interest holder 0 34
Financing costs (6) (78)
Stock repurchases (308) 0
Other 5 (4)
Net cash provided by (used in) financing activities (62) 82
Net increase (decrease) in cash and cash equivalents (155) (42)
Cash and cash equivalents, beginning of period 1,252 1,327
Cash and cash equivalents, end of period 1,097 1,285
Cash paid during the period for    
Interest, net of amounts capitalized 565 509
Income taxes 14 15
Supplemental disclosure of non-cash investing and financing activities:    
Change in capital expenditures included in accounts payable (3) (13)
Additions to property, plant and equipment through assumption of long-term note payable $ 8 $ 0
[1] Includes depreciation and amortization included in fuel and purchased energy expense and interest expense on our Consolidated Condensed Statements of Operations
[2] In addition to changes in market value on derivatives not designated as hedges, changes in unrealized gain (loss) also includes de-designation of interest rate swap cash flow hedges and related reclassification from AOCI into earnings, hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure