SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - IMPAIRMENTS AND OTHER CHARGES (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of significant accounting policies
Impairments of assets	$ 8,600			$ 285
Ghana Assets
Summary of significant accounting policies
Impairments of assets			$ 2,200
Qatar ISSD
Summary of significant accounting policies
Impairments of assets				$ 39
Qatar ISND and ISSD
Summary of significant accounting policies
Impairments of assets					$ 416
Oil and gas
Summary of significant accounting policies
Impairments of assets	$ 6,400	$ 581
Oil and gas | Proved and unproved non-core Permian
Summary of significant accounting policies
Impairments of assets			$ 7,000
Midstream and marketing
Summary of significant accounting policies
Impairments of assets					$ 100