Consolidated Condensed Statements of Cash Flows - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income (loss)		$ (218)	$ 14
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization(1)	[1]	459	342
Non Cash Gains Losses On Extinguishment Of Debt		15	0
Income taxes		11	3
Mark-to-market activity, net	[2]	130	(70)
(Income) from unconsolidated investments in power plants		(10)	(12)
Return on consolidated investments in power plants		18	13
Stock-based compensation expense		17	12
Other Noncash Income (Expense)		(1)	2
Change in operating assets and liabilities, net of effect of acquisition:
Accounts receivable		(78)	29
Derivative instruments, net		(69)	(36)
Other assets		(116)	(118)
Accounts payable and accrued expenses		(90)	(205)
Other liabilities		52	45
Net cash provided by operating activities		120	19
Cash flows from investing activities:
Purchases of property, plant and equipment		(223)	(279)
Purchase of Granite Ridge Energy Center		(526)	0
Decrease in restricted cash		60	34
Other		13	(1)
Net cash used in investing activities		(676)	(246)
Cash flows from financing activities:
Borrowings under CCFC Term Loans and First Lien Term Loans		556	1,592
Repayment of CCFC Term Loans and First Lien Term Loans		(1,209)	(1,613)
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		(81)	(85)
Financing costs		(26)	(17)
Stock repurchases		0	(454)
Proceeds from (Payments for) Other Financing Activities		0	6
Net cash used in financing activities		(135)	(68)
Net decrease in cash and cash equivalents		(691)	(295)
Cash and cash equivalents, beginning of period		906	717
Cash and cash equivalents, end of period		215	422
Cash paid during the period for:
Interest, net of amounts capitalized		289	322
Income taxes		8	17
Supplemental disclosure of non-cash investing and financing activities:
Change in capital expenditures included in accounts payable		24	(20)
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 hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure.