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Industry Segments (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
Industry Segments (Details) $ in Millions	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($) segment
Segment Information
Number of operating segments \| segment				3	3
Net sales		$ 2,648	$ 3,116	$ 7,302	$ 9,674
Pre-tax operating profit (loss)		(268)	(3,051)	(1,063)	(2,781)
Income taxes		30	445	329	140
Discontinued operations, net		(3)	(3)	432	(10)
NET LOSS		(241)	(2,609)	(302)	(2,651)
Oil and Gas
Segment Information
Loss from contract termination		160		160
Impairment charges			3,100
Oil and Gas \| Williston operations
Segment Information
Impairment charges	$ 756
Oil and Gas \| Domestic gas operations
Segment Information
Impairment charges			924		924
Oil and Gas \| Piceance basin
Segment Information
Gain on sale of properties				121
Oil and Gas \| Iraq Operations
Segment Information
Impairment charges			760		760
Oil and Gas \| Libya operations
Segment Information
Impairment charges		112	676	112	676
Oil and Gas \| South Texas Eagle Ford non-operated properties
Segment Information
Impairment charges					195
Gain on sale of properties		59		59
Oil and Gas \| Yemen
Segment Information
Impairment charges					41
Chemical
Segment Information
Gain on sale of property				88	98
Operating segments \| Oil and Gas
Segment Information
Net sales		1,660	2,054	4,560	6,405
Pre-tax operating profit (loss)		(51)	(3,128)	(653)	(3,039)
NET LOSS		(51)	(3,128)	(653)	(3,039)
Operating segments \| Chemical
Segment Information
Net sales		988	1,008	2,786	3,038
Pre-tax operating profit (loss)		117	272	419	547
NET LOSS		117	272	419	547
Operating segments \| Midstream and Marketing
Segment Information
Net sales		202	231	476	722
Pre-tax operating profit (loss)		(180)	24	(333)	96
NET LOSS		(180)	24	(333)	96
Corporate and Elimination
Segment Information
Net sales		(202)	(177)	(520)	(491)
Pre-tax operating profit (loss)		(154)	(219)	(496)	(385)
Income taxes		30	445	329	140
Discontinued operations, net		(3)	(3)	432	(10)
NET LOSS		$ (127)	$ 223	$ 265	$ (255)