REVENUE - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 25,959	$ 17,130	$ 19,192
United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22,787	14,167	15,327
International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,266	3,721	5,129
Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1,094)	(758)	(1,264)
Oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19,285	11,995	14,048
Oil and gas | Oil
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,916	9,888	12,350
Oil and gas | NGL
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,528	1,055	941
Oil and gas | Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,815	986	763
Oil and gas | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	26	66	(6)
Oil and gas | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15,823	9,048	9,492
Oil and gas | United States | Oil
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,072	7,485	8,411
Oil and gas | United States | NGL
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,203	838	658
Oil and gas | United States | Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,524	660	424
Oil and gas | United States | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	24	65	(1)
Oil and gas | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,462	2,947	4,556
Oil and gas | International | Oil
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,844	2,403	3,939
Oil and gas | International | NGL
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	325	217	283
Oil and gas | International | Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	291	326	339
Oil and gas | International | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	1	(5)
Oil and gas | Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Oil and gas | Eliminations | Oil
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Oil and gas | Eliminations | NGL
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Oil and gas | Eliminations | Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Oil and gas | Eliminations | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Chemical
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,243	3,726	4,080
Chemical | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,995	3,524	3,858
Chemical | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	248	202	222
Chemical | Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Midstream and marketing
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,525	2,167	2,328
Midstream and marketing | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,969	1,595	1,977
Midstream and marketing | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	556	572	351
Midstream and marketing | Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0	$ 0