STATEMENT OF CONSOLIDATED OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES AND OTHER:
Oil and gas production revenues	$ 7,348	$ 5,887	$ 5,367
Derivative instrument losses, net	(17)	(135)	0
Gain on divestitures	23	627	21
Other	70	44	(34)
Revenues	7,424	6,423	5,354
OPERATING EXPENSES:
Lease operating expenses	1,439	1,384	1,494
Gathering, transmission, and processing	348	195	200
Taxes other than income	215	151	126
Exploration	503	549	473
General and administrative	431	395	410
Transaction, reorganization, and separation	28	16	39
Depreciation, depletion, and amortization	2,405	2,280	2,618
Asset retirement obligation accretion	108	130	156
Impairments	511	8	1,103
Financing costs, net	478	397	417
Total operating expenses	6,466	5,505	7,036
NET INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	958	918	(1,682)
Current income tax provision	894	595	391
Deferred income tax benefit	(222)	(1,180)	(833)
NET INCOME (LOSS) FROM CONTINUING OPERATIONS INCLUDING NONCONTROLLING INTEREST	286	1,503	(1,240)
Net loss from discontinued operations, net of tax	0	0	(33)
NET INCOME (LOSS) INCLUDING NONCONTROLLING INTEREST	286	1,503	(1,273)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	40	1,304	(1,405)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS:
Net income (loss) from continuing operations attributable to common shareholders	40	1,304	(1,372)
Net loss from discontinued operations	0	0	(33)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ 40	$ 1,304	$ (1,405)
NET INCOME (LOSS) PER COMMON SHARE:
Basic net income (loss) from continuing operations per share (in USD per share)	$ 0.11	$ 3.42	$ (3.62)
Basic net loss from discontinued operations per share (in USD per share)	0.00	0.00	(0.09)
Basic net income (loss) per share (in USD per share)	0.11	3.42	(3.71)
DILUTED NET INCOME (LOSS) PER COMMON SHARE:
Diluted net income (loss) from continuing operations per share (in USD per share)	0.11	3.41	(3.62)
Diluted net loss from discontinued operations per share (in USD per share)	0.00	0.00	(0.09)
Diluted net income (loss) per share (in USD per share)	$ 0.11	$ 3.41	$ (3.71)
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic (in shares)	382	381	379
Diluted (in shares)	384	383	379
DIVIDENDS DECLARED PER COMMON SHARE (in USD per share)	$ 1.00	$ 1.00	$ 1.00
Oil
REVENUES AND OTHER:
Oil and gas production revenues	$ 5,846	$ 4,598	$ 4,172
Natural Gas
REVENUES AND OTHER:
Oil and gas production revenues	919	959	967
Natural Gas Liquids
REVENUES AND OTHER:
Oil and gas production revenues	583	330	228
Noncontrolling Interest, Egypt
OPERATING EXPENSES:
Net income attributable to noncontrolling interest	245	199	132
Noncontrolling Interest, Altus
OPERATING EXPENSES:
Net income attributable to noncontrolling interest	$ 1	$ 0	$ 0