CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows From Operating Activities
Net loss	$ (1,725)	$ (710)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	250	603
Impairment of natural gas and oil properties	1,504	1,535
Amortization of debt issuance cost	4	49
Deferred income taxes		(451)
Loss on derivatives, net of settlement	129	71
Stock-based compensation	17	12
Gain on sale of assets, net		(277)
Restructuring charges	29
Other	7
Change in assets and liabilities:
Accounts receivable	92	162
Inventories	(7)
Accounts payable	(139)	(22)
Taxes payable	(3)	(30)
Interest payable		14
Other assets and liabilities	7	(16)
Net cash provided by operating activities	165	940
Cash Flows From Investing Activities
Capital investments	(241)	(974)
Acquisitions		(569)
Proceeds from sale of property and equipment	54	703
Other	1	10
Net cash used in investing activities	(186)	(830)
Cash Flows From Financing Activities
Payments on current portion of long-term debt	(1)	(1)
Payments on long-term debt		(500)
Payments on short-term debt		(4,500)
Payments on revolving credit facility	(3,268)	(1,534)
Borrowings under revolving credit facility	3,152	1,804
Payments on commercial paper	(242)	(1,182)
Borrowings under commercial paper	242	1,288
Change in bank drafts outstanding	(21)	(1)
Proceeds from issuance of long-term debt	1,191	2,200
Debt issuance costs	(16)	(17)
Proceeds from issuance of common stock		669
Proceeds from issuance of mandatory convertible preferred stock		1,673
Preferred stock dividend	(27)	(25)
Other	(6)
Net cash provided by (used in) financing activities	1,004	(126)
Increase (decrease) in cash and cash equivalents	983	(16)
Cash and cash equivalents at beginning of year	15	53
Cash and cash equivalents at end of period	$ 998	$ 37