CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows From Operating Activities
Net income (loss)	$ (1,132)	$ 78
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	143	$ 293
Impairment of natural gas and oil properties	1,034
Amortization of debt issuance cost	2	$ 46
Deferred income taxes	1	49
Loss on derivatives, net of settlement	21	21
Stock-based compensation	9	6
Restructuring charges	42
Other	5
Change in assets and liabilities:
Accounts receivable	103	38
Accounts payable	(124)	(35)
Taxes payable	(12)	(20)
Interest payable	(11)	(1)
Other assets and liabilities	11	66
Net cash provided by operating activities	92	541
Cash Flows From Investing Activities
Capital investments	(196)	(508)
Acquisitions		(591)
Proceeds from sale of property and equipment		1
Other		3
Net cash used in investing activities	(196)	(1,095)
Cash Flows From Financing Activities
Payments on short-term debt		(4,500)
Payments on revolving credit facility	(864)	(830)
Borrowings under revolving credit facility	2,600	$ 1,330
Payments on commercial paper	(242)
Borrowings under commercial paper	242
Change in bank drafts outstanding	(19)	$ (7)
Proceeds from issuance of long-term debt		2,200
Debt issuance costs		(17)
Proceeds from issuance of common stock		669
Proceeds from issuance of mandatory convertible preferred stock		1,673
Preferred stock dividend	(27)
Other	(4)
Net cash provided by financing activities	1,686	518
Increase (decrease) in cash and cash equivalents	1,582	(36)
Cash and cash equivalents at beginning of year	15	53
Cash and cash equivalents at end of period	$ 1,597	$ 17