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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income (loss) $ 18 $ 199 $ (189)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization expense(1) 654 [1] 605 [1] 587 [1]
Debt extinguishment costs 43 0 82
Deferred income taxes 14 1 (21)
(Gain) loss on sale of power plants and other, net 4 (212) 13
Unrealized mark-to-market activity, net 12 [2] (72) [2] (30) [2]
(Income) from unconsolidated investments in power plants (30) (28) (21)
Return on unconsolidated investments in power plants 25 24 6
Stock-based compensation expense 36 25 24
Change in operating assets and liabilities, net of effects of acquisitions: (3) 1 6
Change in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable (113) 159 74
Derivative instruments, net (7) (52) 15
Other assets (148) (57) 1
Accounts payable and accrued expenses (1) (86) 28
Settlement of non-hedging interest rate swaps 0 156 189
Other liabilities 45 (10) 11
Net cash provided by operating activities 549 653 775
Cash flows from investing activities:      
Purchases of property, plant and equipment (575) (637) (683)
Proceeds from sale of power plants, interests and other 1 825 13
Purchase of Bosque Energy Center, net of cash 0 (432) 0
Return of investment from unconsolidated investments in power plants 2 5 0
Settlement of non-hedging interest rate swaps 0 (156) (189)
(Increase) decrease in restricted cash (18) (59) 54
Purchases of deferred transmission credits 0 (12) (31)
Other (3) (4) 0
Net cash used in investing activities (593) (470) (836)
Cash flows from financing activities:      
Borrowings under First Lien Term Loans 390 835 1,657
Repayments of First Lien Term Loans (25) (19) 0
Borrowings from CCFC Term Loans 1,197 0 0
Repayments under CCFC Term Loans (6) 0 0
Repayment of CCFC Notes (1,000) 0 0
Repayments on NDH Project Debt 0 0 (1,283)
Borrowings under First Lien Notes 1,234 0 1,200
Repayments of First Lien Notes (1,550) (590) 0
Repayments on First Lien Credit Facility 0 0 (1,195)
Borrowings from project financing, notes payable and other 182 389 327
Repayments of project financing, notes payable and other (66) (289) (550)
Capital contributions from noncontrolling interest holder 0 0 33
Financing costs (53) (20) (81)
Stock repurchases (623) (463) (119)
Proceeds from exercises of stock options 20 5 0
Other 1 1 (3)
Net cash used in financing activities (299) (151) (14)
Net increase (decrease) in cash and cash equivalents (343) 32 (75)
Cash and cash equivalents, beginning of period 1,284 1,252 1,327
Cash and cash equivalents, end of period 941 1,284 1,252
Cash paid during the period for:      
Interest, net of amounts capitalized 672 719 656
Income taxes 24 16 18
Supplemental disclosure of non-cash investing activities:      
Change in capital expenditures included in accounts payable 27 19 (24)
Other non-cash additions to property, plant and equipment $ 0 $ 13 $ 0
[1] Includes depreciation and amortization included in fuel and purchased energy expense and interest expense on our Consolidated Statements of Operations.
[2] In addition to changes in market value on derivatives not designated as hedges, changes in unrealized gain (loss) also includes hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure.