Consolidated Condensed Statements of Cash Flows - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income		$ 83	$ 293
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization(1)	[1]	672	519
Non Cash Gains Losses On Extinguishment Of Debt		15	1
Deferred income taxes		15	12
Mark-to-market activity, net	[2]	21	4
(Income) from unconsolidated investments in power plants		(16)	(18)
Return on consolidated investments in power plants		19	23
Stock-based compensation expense		23	19
Other Noncash Income (Expense)		1	(1)
Change in operating assets and liabilities, net of effect of acquisition:
Accounts receivable		(168)	42
Derivative instruments, net		(71)	(44)
Other assets		(75)	(199)
Accounts payable and accrued expenses		46	(200)
Other liabilities		102	108
Net cash provided by operating activities		667	559
Cash flows from investing activities:
Purchases of property, plant and equipment		(337)	(411)
Purchase of Granite Ridge Energy Center		(526)	0
Decrease (increase) in restricted cash		2	(31)
Other		20	(8)
Net cash used in investing activities		(841)	(450)
Cash flows from financing activities:
Borrowings under First Lien Term Loans		556	1,592
Repayment of CCFC Term Loans and First Lien Term Loans		(1,220)	(1,622)
Borrowings under Senior Unsecured Notes		0	650
Borrowings under First Lien Notes		625	0
Repurchase of First Lien Notes		0	(147)
Repayments of project financing, notes payable and other		(98)	(102)
Financing costs		(27)	(17)
Stock repurchases		0	(510)
Shares withheld for tax obligations on share-based awards		(5)	(11)
Other		(2)	0
Net cash used in financing activities		(171)	(167)
Net decrease in cash and cash equivalents		(345)	(58)
Cash and cash equivalents, beginning of period		906	717
Cash and cash equivalents, end of period		561	659
Cash paid during the period for:
Interest, net of amounts capitalized		421	465
Income taxes		10	19
Supplemental disclosure of non-cash investing and financing activities:
Change in capital expenditures included in accounts payable		(4)	(17)
Capital Lease Obligations Incurred		$ 0	$ 9

[1] Includes amortization recorded in Commodity revenue and Commodity expense associated with intangible assets and amortization recorded in interest expense associated with debt issuance costs and discounts.

[2] In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes de-designation of interest rate swap cash flow hedges and related reclassification of AOCI into earnings, hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure.