Statement of Consolidated Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015		Sep. 30, 2016	Sep. 30, 2015
Oil and gas production revenues
Oil and Gas Production Revenues	$ 1,439	$ 1,606	[1]	$ 3,912	$ 5,256	[1]
Other	(6)	(75)	[1]	(30)	(53)	[1]
Gain (loss) on divestitures	5	(5)	[1]	21	204	[1],[2]
Total revenues and other	1,438	1,526	[1]	3,903	5,407	[1]
OPERATING EXPENSES:
Lease operating expenses	382	450	[1]	1,119	1,398	[1]
Gathering and transportation	51	58	[1]	155	163	[1]
Taxes other than income	9	104	[1]	85	232	[1]
Exploration	161	223	[1]	347	706	[1]
General and administrative	102	89	[1]	298	284	[1]
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	648	872		1,995	2,492	[2]
Asset retirement obligation accretion	40	37	[1]	116	109	[1],[2]
Impairments	836	3,903	[1]	1,009	6,327	[1],[2]
Transaction, reorganization, and separation	12	0	[1]	36	120	[1]
Financing costs, net	102	160	[1]	311	401	[1]
Total operating expenses	2,343	5,896	[1]	5,471	12,232	[1]
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(905)	(4,370)	[1]	(1,568)	(6,825)	[1]
Current income tax provision (benefit)	150	(270)	[1]	284	578	[1]
Deferred income tax provision (benefit)	(529)	19	[1]	(755)	(1,299)	[1],[2]
NET LOSS FROM CONTINUING OPERATIONS INCLUDING NONCONTROLLING INTEREST	(526)	(4,119)	[1]	(1,097)	(6,104)	[1]
Net loss from discontinued operations, net of tax	(33)	(17)	[1]	(33)	(135)	[1]
NET LOSS INCLUDING NONCONTROLLING INTEREST	(559)	(4,136)	[1]	(1,130)	(6,239)	[1],[2]
Net income attributable to noncontrolling interest	48	7	[1]	93	98	[1]
NET LOSS ATTRIBUTABLE TO COMMON STOCK	(607)	(4,143)	[1]	(1,223)	(6,337)	[1]
NET LOSS ATTRIBUTABLE TO COMMON SHAREHOLDERS:
Net loss from continuing operations attributable to common shareholders	(574)	(4,126)	[1]	(1,190)	(6,202)	[1]
Net loss from discontinued operations	(33)	(17)	[1]	(33)	(135)	[1],[2]
NET LOSS ATTRIBUTABLE TO COMMON STOCK	$ (607)	$ (4,143)	[1]	$ (1,223)	$ (6,337)	[1]
NET LOSS PER COMMON SHARE:
Basic net loss from continuing operations per share	$ (1.51)	$ (10.91)	[1]	$ (3.14)	$ (16.42)	[1]
Basic net loss from discontinued operations per share	(0.09)	(0.04)	[1]	(0.08)	(0.36)	[1]
Basic net loss per share	(1.60)	(10.95)	[1]	(3.22)	(16.78)	[1]
DILUTED NET LOSS PER COMMON SHARE:
Diluted net loss from continuing operations per share	(1.51)	(10.91)	[1]	(3.14)	(16.42)	[1]
Diluted net loss from discontinued operations per share	(0.09)	(0.04)	[1]	(0.08)	(0.36)	[1]
Diluted net loss per share	$ (1.60)	$ (10.95)	[1]	$ (3.22)	$ (16.78)	[1]
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic (in shares)	380	378	[1]	379	378	[1]
Diluted (in shares)	380	378	[1]	379	378	[1]
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.25	$ 0.25		$ 0.75	$ 0.75
Oil and gas property and equipment [Member]
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	$ 610	$ 793	[1]	$ 1,875	$ 2,247	[1]
Other assets [Member]
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	38	79	[1]	120	245	[1]
Oil [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	1,117	1,238	[1]	3,057	4,149	[1]
Gas [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	263	318	[1]	695	941	[1]
Natural gas liquids [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	$ 59	$ 50	[1]	$ 160	$ 166	[1]

[1] Financial information for 2015 has been recast to reflect retrospective application of the successful efforts method of accounting. See Note 1.

[2] Financial information for 2015 has been recast to reflect retrospective application of the successful efforts method of accounting. See Note 1.