Consolidated Condensed Statements of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss		$ (194)	$ (7)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization(1)	[1]	226	171
Income tax expense		35	0
Mark-to-market activity, net	[2]	94	(71)
(Income) from unconsolidated investments in power plants		(7)	(5)
Stock-based compensation expense		9	11
Other Noncash Income (Expense)		(4)	(2)
Change in operating assets and liabilities, net of effect of acquisition:
Accounts receivable		87	120
Derivative instruments, net		(12)	(17)
Other assets		(19)	(28)
Accounts payable and accrued expenses		(207)	(204)
Other liabilities		18	15
Net cash provided by (used in) operating activities		26	(17)
Cash flows from investing activities:
Purchases of property, plant and equipment		(133)	(162)
Purchase of Granite Ridge Energy Center		(527)	0
Decrease in restricted cash		43	35
Other		6	(1)
Net cash used in investing activities		(611)	(128)
Cash flows from financing activities:
Repayment of CCFC Term Loans and First Lien Term Loans		(13)	(11)
Borrowings under Senior Unsecured Notes		0	650
Repurchase of First Lien Notes		0	(147)
Repayments of project financing, notes payable and other		(56)	(58)
Distribution to noncontrolling interest holder		2	0
Financing costs		(7)	(11)
Stock repurchases		0	(202)
Proceeds from exercises of stock options		0	3
Proceeds from (Payments for) Other Financing Activities		1	0
Net cash provided by (used in) financing activities		(77)	224
Net increase (decrease) in cash and cash equivalents		(662)	79
Cash and cash equivalents, beginning of period		906	717
Cash and cash equivalents, end of period		244	796
Cash paid during the period for:
Interest, net of amounts capitalized		150	146
Income taxes		2	6
Supplemental disclosure of non-cash investing activities:
Change in capital expenditures included in accounts payable		$ 15	$ (22)

[1] Includes depreciation and amortization included in Commodity revenue, Commodity 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 mark-to-market gain (loss) also includes hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure.