CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows From Operating Activities
Net income (loss)	$ (710)	$ 401
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	603	$ 455
Impairment of natural gas and oil properties	1,535
Amortization of debt issuance cost	49	$ 2
Deferred income taxes	(451)	267
Loss on derivatives excluding derivatives, settled	71	62
Stock-based compensation	12	$ 9
Gain on sale of assets, net	(277)
Change in assets and liabilities:
Accounts receivable	162	$ (49)
Accounts payable	(22)	53
Taxes receivable	(30)	(2)
Interest payable	14
Other assets and liabilities	(16)	(4)
Net cash provided by operating activities	940	1,194
Cash Flows From Investing Activities
Capital investments	(974)	(970)
Acquisitions	(569)	(174)
Proceeds from sale of property and equipment	703	17
Other	10	3
Net cash used in investing activities	(830)	(1,124)
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	(1,534)	(2,486)
Borrowings under revolving credit facility	1,804	$ 2,375
Payments on commercial paper	(1,182)
Borrowings under commercial paper	1,288
Change in bank drafts outstanding	(1)	$ 30
Proceeds from issuance of long-term debt	2,200
Debt issuance costs	(17)
Proceeds from exercise of common stock options		9
Proceeds from issuance of common stock	669
Proceeds from issuance of mandatory convertible preferred stock	1,673
Mandatory convertible preferred stock dividend	(25)
Net cash used in financing activities	(126)	(73)
Decrease in cash and cash equivalents	(16)	(3)
Cash and cash equivalents at beginning of year	53	23
Cash and cash equivalents at end of period	$ 37	$ 20