INCOME TAXES - COMPONENTS OF DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax liabilities
Property, plant and equipment differences	$ (9,905)	$ (10,744)
Equity investments, partnerships and international subsidiaries	(571)	(658)
Gross long-term deferred tax liabilities	(10,476)	(11,402)
Deferred tax assets
Environmental reserves	242	257
Postretirement benefit accruals	285	398
Deferred compensation and benefits	286	186
Asset retirement obligations	850	942
Foreign tax credit carryforwards	3,904	4,465
General business credit carryforwards	698	607
Net operating loss carryforward	1,628	1,797
Interest expense carryforward	28	668
All other	689	720
Gross long-term deferred tax assets	8,610	10,040
Valuation allowance	(5,136)	(5,695)
Net long-term deferred tax assets	3,474	4,345
Total deferred income tax liability, net	(7,002)	(7,057)
Net long-term deferred tax assets	(37)	(56)
Total deferred income tax liability, gross	$ (7,039)	$ (7,113)