CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities:
Net income (loss)	$ 351	$ (1,132)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	106	143
Impairment of natural gas and oil properties		1,034
Amortization of debt issuance costs	2	2
Deferred income taxes		1
(Gain) loss on derivatives, unsettled	(146)	21
Stock-based compensation	6	9
Restructuring charges		42
Loss on early extinguishment of debt	1
Other	(2)	5
Change in assets and liabilities:
Accounts receivable	53	103
Accounts payable	(13)	(124)
Taxes payable	(8)	(12)
Interest payable	(24)	(11)
Other assets and liabilities	(14)	11
Net cash provided by operating activities	312	92
Cash Flows From Investing Activities:
Capital investments	(340)	(196)
Proceeds from sale of property and equipment	2
Other	4
Net cash used in investing activities	(334)	(196)
Cash Flows From Financing Activities:
Payments on short-term debt	(25)
Payments on revolving credit facility		(864)
Borrowings under revolving credit facility		2,600
Payments on commercial paper		(242)
Borrowings under commercial paper		242
Change in bank drafts outstanding	6	(19)
Preferred stock dividend		(27)
Other		(4)
Net cash provided by (used in) financing activities	(19)	1,686
Increase (decrease) in cash and cash equivalents	(41)	1,582
Cash and cash equivalents at beginning of year	1,423	15
Cash and cash equivalents at end of period	$ 1,382	$ 1,597