Statement of Consolidated Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Oil and gas production revenues
Oil and Gas Production Revenues	$ 1,512	$ 1,087
Other	25	(3)
Gain (loss) on divestitures	341	(1)
Total revenues and other	1,878	1,083
OPERATING EXPENSES:
Lease operating expenses	336	378
Gathering and transportation	57	52
Taxes other than income	42	11
Exploration	92	95
General and administrative	103	93
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	576	678
Asset retirement obligation accretion	36	38
Impairments	8	0
Transaction, reorganization, and separation	(10)	15
Financing costs, net	100	105
Total operating expenses	1,340	1,465
NET INCOME (LOSS) BEFORE INCOME TAXES	538	(382)
Current income tax provision (benefit)	188	(10)
Deferred income tax provision (benefit)	83	(1)
NET INCOME (LOSS) INCLUDING NONCONTROLLING INTEREST	267	(371)
Net income attributable to noncontrolling interest	54	1
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ 213	$ (372)
NET INCOME (LOSS) PER COMMON SHARE:
Basic (in USD per share)	$ 0.56	$ (0.98)
Diluted (in USD per share)	$ 0.56	$ (0.98)
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic (in shares)	380	378
Diluted (in shares)	383	378
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.25	$ 0.25
Oil and gas property and equipment [Member]
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	$ 538	$ 636
Other assets [Member]
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	38	42
Oil [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	1,172	822
Gas [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	255	223
Natural gas liquids [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	$ 85	$ 42