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INDUSTRY SEGMENTS AND GEOGRAPHIC AREAS (Details) $ in Millions		1 Months Ended	12 Months Ended
	Nov. 30, 2014 USD ($)	Apr. 30, 2014 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Industry Segments
Number of operating segments \| segment			3
Segment Information
Net sales			$ 12,480.0	$ 19,312.0	$ 20,170.0
Pretax operating profit (loss)			(9,476.0)	1,555.0	8,146.0
Income taxes			1,330.0	(1,685.0)	(3,214.0)
Discontinued operations, net			317.0	760.0	971.0
Less: Net income attributable to noncontrolling interest				(14.0)
Net income (loss) attributable to common stock			(7,829.0)	616.0	5,903.0
Equity Method Investments			1,267.0	1,171.0	1,459.0
Pretax Asset Impairment and Related Items			10,239.0	7,379.0	621.0
Property, plant and equipment additions, net			5,409.0	9,110.0	7,494.0
Depreciation, depletion and amortization			4,544.0	4,261.0	4,203.0
Assets			43,437.0	56,259.0	69,443.0
Gain on sale of idled site			98.0
International oil and gas assets
Segment Information
Impairment charges			5,000.0
Total Foreign
Segment Information
Net sales			5,001.0	7,369.0	8,446.0
Impairment charges				1,100.0
Colombia
Segment Information
Net sales			570.0	938.0	1,022.0
Domestic oil and gas assets
Segment Information
Impairment charges			$ 3,500.0	4,700.0
BridgeTex
Segment Information
Gain (loss) on sale	$ 633.0			$ 633.0
Oil and Gas \| Non-producing domestic oil and gas acreage member
Segment Information
Impairment charges					$ 607.0
Oil and Gas \| Oil
Segment Information
Product revenue to net sales (as a percent)			90.00%	90.00%	91.00%
Chemical
Segment Information
Impairment charges				$ 149.0
Non Cash Asset Impairment loss			$ 121.0
Chemical \| Basic Chemicals
Segment Information
Product revenue to net sales (as a percent)			56.00%	54.00%	55.00%
Chemical \| Vinyls
Segment Information
Product revenue to net sales (as a percent)			40.00%	43.00%	42.00%
Chemical \| Other Chemicals
Segment Information
Product revenue to net sales (as a percent)			4.00%	3.00%	3.00%
Midstream and Marketing
Segment Information
Other pre-tax charges					$ 58.0
Midstream and Marketing \| Gas Processing
Segment Information
Sales revenues for businesses as a percentage of total sales revenues			70.00%	49.00%	54.00%
Midstream and Marketing \| Power
Segment Information
Sales revenues for businesses as a percentage of total sales revenues			31.00%	31.00%	30.00%
Midstream and Marketing \| Marketing, Trading, Transportation and other
Segment Information
Sales revenues for businesses as a percentage of total sales revenues			(1.00%)	20.00%	16.00%
Operating segments \| Oil and Gas
Segment Information
Net sales			$ 8,304.0	$ 13,887.0	$ 15,008.0
Pretax operating profit (loss)			(8,060.0)	428.0	6,411.0
Net income (loss) attributable to common stock			(8,060.0)	428.0	6,411.0
Equity Method Investments			4.0	11.0	108.0
Property, plant and equipment additions, net			4,485.0	6,589.0	5,456.0
Depreciation, depletion and amortization			3,886.0	3,701.0	3,676.0
Assets			23,591.0	31,072.0	46,213.0
Operating segments \| Chemical
Segment Information
Net sales			3,945.0	4,817.0	4,673.0
Pretax operating profit (loss)			542.0	420.0	743.0
Net income (loss) attributable to common stock			542.0	420.0	743.0
Equity Method Investments			550.0	202.0	34.0
Property, plant and equipment additions, net			271.0	325.0	435.0
Depreciation, depletion and amortization			371.0	367.0	346.0
Assets			3,982.0	3,917.0	3,947.0
Operating segments \| Midstream and Marketing
Segment Information
Net sales			891.0	1,373.0	1,174.0
Pretax operating profit (loss)			(1,194.0)	2,578.0	1,523.0
Less: Net income attributable to noncontrolling interest				(14.0)
Net income (loss) attributable to common stock			(1,194.0)	2,564.0	1,523.0
Equity Method Investments			708.0	948.0	1,307.0
Property, plant and equipment additions, net			611.0	2,093.0	1,437.0
Depreciation, depletion and amortization			249.0	160.0	149.0
Assets			10,175.0	12,283.0	14,374.0
Corporate and Eliminations
Segment Information
Net sales			(660.0)	(765.0)	(685.0)
Pretax operating profit (loss)			(764.0)	(1,871.0)	(531.0)
Income taxes			1,330.0	(1,685.0)	(3,214.0)
Discontinued operations, net			317.0	760.0	971.0
Net income (loss) attributable to common stock			883.0	(2,796.0)	(2,774.0)
Equity Method Investments			5.0		10.0
Property, plant and equipment additions, net			42.0	103.0	166.0
Depreciation, depletion and amortization			38.0	33.0	32.0
Assets			$ 5,689.0	8,987.0	4,909.0
Impaired property, plant and equipment				10.0
Corporate and Eliminations \| Midstream and Marketing
Segment Information
Other pre-tax charges				31.0
General Partner of Plains All American Pipeline,L.P
Segment Information
Gain on sale of investments and other items					1,044.0
Gain (loss) on sale				1,351.0
Hugoton Field operations
Segment Information
Gain on sale of idled site		$ 531.0		$ 531.0
Carbocloro member \| Chemical
Segment Information
Impairment charges					$ 131.0