REVENUE - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 17,130	$ 19,192
United States
Disaggregation of Revenue [Line Items]
Revenue from customers	14,167	15,327
Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	2,774	4,204
Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	604	858
Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	343	67
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from customers	(758)	(1,264)
Oil and gas
Disaggregation of Revenue [Line Items]
Revenue from customers	11,995	14,048
Oil and gas | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	9,888	12,350
Oil and gas | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	1,055	941
Oil and gas | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	986	763
Oil and gas | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	66	(6)
Oil and gas | United States
Disaggregation of Revenue [Line Items]
Revenue from customers	9,048	9,492
Oil and gas | United States | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	7,485	8,411
Oil and gas | United States | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	838	658
Oil and gas | United States | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	660	424
Oil and gas | United States | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	65	(1)
Oil and gas | Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	2,480	3,853
Oil and gas | Middle East | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	1,949	3,256
Oil and gas | Middle East | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	217	283
Oil and gas | Middle East | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	313	319
Oil and gas | Middle East | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	1	(5)
Oil and gas | Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	467	703
Oil and gas | Latin America | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	454	683
Oil and gas | Latin America | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Latin America | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	13	20
Oil and gas | Latin America | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Other International | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Other International | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Other International | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Other International | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Intersegment Eliminations | Oil
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Intersegment Eliminations | NGL
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Intersegment Eliminations | Gas
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Oil and gas | Intersegment Eliminations | Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Chemical
Disaggregation of Revenue [Line Items]
Revenue from customers	3,726	4,080
Chemical | United States
Disaggregation of Revenue [Line Items]
Revenue from customers	3,524	3,858
Chemical | Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Chemical | Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	137	155
Chemical | Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	65	67
Chemical | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing
Disaggregation of Revenue [Line Items]
Revenue from customers	2,167	2,328
Midstream and marketing | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	644	746
Midstream and marketing | Marketing
Disaggregation of Revenue [Line Items]
Revenue from customers	1,422	436
Midstream and marketing | WES - Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers		1,110
Midstream and marketing | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	101	36
Midstream and marketing | United States
Disaggregation of Revenue [Line Items]
Revenue from customers	1,595	1,977
Midstream and marketing | United States | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	350	395
Midstream and marketing | United States | Marketing
Disaggregation of Revenue [Line Items]
Revenue from customers	1,144	436
Midstream and marketing | United States | WES - Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers		1,110
Midstream and marketing | United States | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	101	36
Midstream and marketing | Middle East
Disaggregation of Revenue [Line Items]
Revenue from customers	294	351
Midstream and marketing | Middle East | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	294	351
Midstream and marketing | Middle East | Marketing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Middle East | WES - Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers		0
Midstream and marketing | Middle East | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Latin America
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Latin America | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Latin America | Marketing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Latin America | WES - Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers		0
Midstream and marketing | Latin America | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Other International
Disaggregation of Revenue [Line Items]
Revenue from customers	278	0
Midstream and marketing | Other International | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Other International | Marketing
Disaggregation of Revenue [Line Items]
Revenue from customers	278	0
Midstream and marketing | Other International | WES - Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers		0
Midstream and marketing | Other International | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Intersegment Eliminations | Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Intersegment Eliminations | Marketing
Disaggregation of Revenue [Line Items]
Revenue from customers	0	0
Midstream and marketing | Intersegment Eliminations | WES - Gas Processing | WES
Disaggregation of Revenue [Line Items]
Revenue from customers		0
Midstream and marketing | Intersegment Eliminations | Power and Other
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 0	$ 0