STATEMENT OF CONSOLIDATED OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Oil and gas production revenues
Oil and Gas Production Revenues	$ 1,346	$ 1,386	$ 2,858	$ 2,473
Other	59	(21)	84	(24)
Gain (loss) on divestitures	(21)	17	320	16
Total revenues and other	1,384	1,382	3,262	2,465
OPERATING EXPENSES:
Lease operating expenses	372	359	708	737
Gathering and transportation	48	52	105	104
Taxes other than income	29	65	71	76
Exploration	108	91	200	186
General and administrative	106	103	209	196
Transaction, reorganization, and separation	4	9	(6)	24
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	572	669	1,148	1,347
Asset retirement obligation accretion	37	38	73	76
Impairments	0	173	8	173
Financing costs, net	99	104	199	209
Total operating expenses	1,375	1,663	2,715	3,128
NET INCOME (LOSS) BEFORE INCOME TAXES	9	(281)	547	(663)
Current income tax provision	126	144	314	134
Deferred income tax benefit	(730)	(225)	(647)	(226)
NET INCOME (LOSS) INCLUDING NONCONTROLLING INTEREST	613	(200)	880	(571)
Net income attributable to noncontrolling interest	41	44	95	45
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ 572	$ (244)	$ 785	$ (616)
NET INCOME (LOSS) PER COMMON SHARE:
Basic (in USD per share)	$ 1.50	$ (0.65)	$ 2.06	$ (1.63)
Diluted (in USD per share)	$ 1.50	$ (0.65)	$ 2.05	$ (1.63)
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic (in shares)	381	379	380	379
Diluted (in shares)	383	379	383	379
DIVIDENDS DECLARED PER COMMON SHARE (in USD per share)	$ 0.25	$ 0.25	$ 0.50	$ 0.5
Oil and gas property and equipment [Member]
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	$ 536	$ 629	$ 1,074	$ 1,265
Other assets [Member]
Depreciation, depletion, and amortization:
Depreciation, depletion and amortization	36	40	74	82
Oil revenues [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	1,050	1,118	2,222	1,940
Gas revenues [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	233	209	488	432
Natural gas liquids revenues [Member]
Oil and gas production revenues
Oil and Gas Production Revenues	$ 63	$ 59	$ 148	$ 101