REVENUE - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 18,674	$ 15,560
United States
Disaggregation of Revenue [Line Items]
Revenue from customers	15,327	11,086
Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	3,686	4,388
Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	858	936
Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	67	80
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from customers	(1,264)	(930)
Intersegment Eliminations | United States
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Intersegment Eliminations | Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Intersegment Eliminations | Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Intersegment Eliminations | Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment
Disaggregation of Revenue [Line Items]
Revenue from customers	13,530	10,441
Oil and Gas Segment | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	11,852	9,245
Oil and Gas Segment | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	921	691
Oil and Gas Segment | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	763	495
Oil and Gas Segment | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	(6)	10
Oil and Gas Segment | United States
Disaggregation of Revenue [Line Items]
Revenue from customers	9,492	5,747
Oil and Gas Segment | United States | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	8,411	5,125
Oil and Gas Segment | United States | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	658	430
Oil and Gas Segment | United States | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	424	185
Oil and Gas Segment | United States | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	(1)	7
Oil and Gas Segment | Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	3,335	3,963
Oil and Gas Segment | Middle East | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	2,758	3,405
Oil and Gas Segment | Middle East | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	263	261
Oil and Gas Segment | Middle East | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	319	294
Oil and Gas Segment | Middle East | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	(5)	3
Oil and Gas Segment | Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	703	731
Oil and Gas Segment | Latin America | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	683	715
Oil and Gas Segment | Latin America | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Latin America | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	20	16
Oil and Gas Segment | Latin America | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Other International | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Other International | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Other International | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Other International | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Intersegment Eliminations | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Intersegment Eliminations | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Intersegment Eliminations | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and Gas Segment | Intersegment Eliminations | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Chemical Segment
Disaggregation of Revenue [Line Items]
Revenue from customers	4,080	4,648
Chemical Segment | United States
Disaggregation of Revenue [Line Items]
Revenue from customers	3,858	4,363
Chemical Segment | Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Chemical Segment | Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	155	205
Chemical Segment | Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	67	80
Chemical Segment | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment
Disaggregation of Revenue [Line Items]
Revenue from customers	2,328	1,401
Midstream Segment | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	746	982
Midstream Segment | Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers	1,110
Midstream Segment | Pipelines
Disaggregation of Revenue [Line Items]
Revenue from customers		311
Midstream Segment | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	472	108
Midstream Segment | United States
Disaggregation of Revenue [Line Items]
Revenue from customers	1,977	976
Midstream Segment | United States | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	395	557
Midstream Segment | United States | Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers	1,110
Midstream Segment | United States | Pipelines
Disaggregation of Revenue [Line Items]
Revenue from customers		311
Midstream Segment | United States | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	472	108
Midstream Segment | Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	351	425
Midstream Segment | Middle East | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	351	425
Midstream Segment | Middle East | Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers	0
Midstream Segment | Middle East | Pipelines
Disaggregation of Revenue [Line Items]
Revenue from customers		0
Midstream Segment | Middle East | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Latin America | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Latin America | Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers	0
Midstream Segment | Latin America | Pipelines
Disaggregation of Revenue [Line Items]
Revenue from customers		0
Midstream Segment | Latin America | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Other International | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Other International | Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers	0
Midstream Segment | Other International | Pipelines
Disaggregation of Revenue [Line Items]
Revenue from customers		0
Midstream Segment | Other International | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Intersegment Eliminations | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream Segment | Intersegment Eliminations | Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers	0
Midstream Segment | Intersegment Eliminations | Pipelines
Disaggregation of Revenue [Line Items]
Revenue from customers		0
Midstream Segment | Intersegment Eliminations | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 0	$ 0