CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Revenues and Other
Oil sales	$ 1,422		$ 1,125	$ 3,085		$ 1,975
Natural-gas sales	319		320	821		686
Natural-gas liquids sales	214		235	503		413
Gathering, processing, and marketing sales	464		305	908		545
Gains (losses) on divestitures and other, net	297		(70)	1,166		(30)
Total	2,716		1,915	6,483		3,589
Costs and Expenses
Oil and gas operating	233		202	491		410
Oil and gas transportation	229		246	478		488
Exploration	535		76	1,620		202
Gathering, processing, and marketing	359		252	710		467
General and administrative	291		305	560		754
Depreciation, depletion, and amortization	1,037		984	2,152		2,133
Production, property, and other taxes	135		157	290		274
Impairments	10		18	383		34
Other operating expense	12		7	34		23
Total	2,841		2,247	6,718		4,785
Operating Income (Loss)	(125)		(332)	(235)		(1,196)
Other (Income) Expense
Interest expense	227		217	450		437
Loss on early extinguishment of debt	2		124	2		124
(Gains) losses on derivatives, net	32		311	(115)		610
Other (income) expense, net	(14)		(55)	(22)		(55)
Total	247		593	315		1,110
Income (Loss) Before Income Taxes	(372)		(925)	(550)		(2,306)
Income tax expense (benefit)	(38)		(314)	59		(697)
Net Income (Loss)	(334)		(611)	(609)		(1,609)
Net income (loss) attributable to noncontrolling interests	81	[1]	81	124	[1]	117
Net Income (Loss) Attributable to Common Stockholders	$ (415)		$ (692)	$ (733)		$ (1,726)
Per Common Share
Net income (loss) attributable to common stockholders—basic (in usd per share)	$ (0.76)		$ (1.36)	$ (1.34)		$ (3.39)
Net income (loss) attributable to common stockholders—diluted (in usd per share)	$ (0.76)		$ (1.36)	$ (1.34)		$ (3.39)
Average Number of Common Shares Outstanding—Basic	552		510	552		510
Average Number of Common Shares Outstanding—Diluted	552		510	552		510
Dividends (in usd per share)	$ 0.05		$ 0.05	$ 0.10		$ 0.10
Commodity Contract and Interest Rate Swap [Member]
Other (Income) Expense
(Gains) losses on derivatives, net	$ 32		$ 307	$ (115)		$ 604

[1] Presentation has been adjusted to align with the current analysis of segment performance. Net income (loss) attributable to noncontrolling interests, previously reported within the Midstream segment, is now presented within Other and Intersegment Eliminations. Other revenues, previously reported within Other and Intersegment Eliminations, is now presented within the applicable segments.