CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows From Operating Activities:
Net income (loss)	$ 635	$ (1,725)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	229	250
Impairment of natural gas and oil properties		1,504
Amortization of debt issuance costs	4	4
(Gain) loss on derivatives, unsettled	(319)	129
Stock-based compensation	12	17
Restructuring charges		29
Loss on early extinguishment of debt	11
Other	(4)	7
Change in assets and liabilities:
Accounts receivable	12	92
Accounts payable	2	(139)
Taxes payable	5	(3)
Interest payable	(4)
Other assets and liabilities	(5)
Net cash provided by operating activities	578	165
Cash Flows From Investing Activities:
Capital investments	(619)	(241)
Proceeds from sale of property and equipment	12	54
Other	1	1
Net cash used in investing activities	(606)	(186)
Cash Flows From Financing Activities:
Payments on short-term debt	(287)	(1)
Payments on revolving credit facility		(3,268)
Borrowings under revolving credit facility		3,152
Payments on commercial paper		(242)
Borrowings under commercial paper		242
Change in bank drafts outstanding	3	(21)
Proceeds from issuance of long-term debt		1,191
Debt issuance costs		(16)
Preferred stock dividend		(27)
Other		(6)
Net cash provided by (used in) financing activities	(284)	1,004
Increase (decrease) in cash and cash equivalents	(312)	983
Cash and cash equivalents at beginning of year	1,423	15
Cash and cash equivalents at end of period	$ 1,111	$ 998