STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Millions		3 Months Ended					12 Months Ended
	Aug. 08, 2019 $ / shares shares	Dec. 31, 2021 USD ($) shares	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Aug. 03, 2020 USD ($) $ / shares shares	Jun. 26, 2020	Dec. 31, 2018 USD ($)
Common stock issuances
Balance at the beginning of the year (in shares)					1,080,565,000	1,044,435,000	1,080,565,000	1,044,435,000	895,116,000
Issued (in shares)							2,522,000	36,130,000	3,188,000
Issued as part of the acquisition (in shares)									146,131,000
Options exercised and other, net (in shares)							336,000
Balance at the end of the year (in shares)		1,083,423,000					1,083,423,000	1,080,565,000	1,044,435,000
TREASURY STOCK
Share repurchase program, authorized shares (in shares)		185,000,000					185,000,000
Share repurchase program, shares yet to be repurchased (in shares)		44,200,000					44,200,000
Shares purchased under share repurchase program (in shares)							0	0	2,700,000
Share repurchase program, average cost per share of shares repurchased during period (in dollars per share) | $ / shares									$ 66.94
Treasury stock, shares (in shares)		149,348,394					149,348,394	149,051,634	150,300,000
PREFERRED STOCK
Issued as part of the acquisition (in shares)									146,131,000
Preferred stock dividends paid | $		$ 200	$ 200	$ 200	$ 200
Preferred stock issued (in shares)		100,000					100,000	100,000
Preferred stock, shares outstanding (in shares)		100,000					100,000	100,000	0
Basic earnings (loss) per common share
Income (loss) from continuing operations | $							$ 2,790	$ (13,533)	$ (507)
Loss from discontinued operations | $							(468)	(1,298)	(15)
NET INCOME (LOSS) | $							2,322	(14,831)	(522)
Less: Net income attributable to noncontrolling interest | $							0	0	(145)
Less: Preferred stock dividends | $							(800)	(844)	(318)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS | $							1,522	(15,675)	(985)
Less: Net income allocated to participating securities | $							(10)	0	0
Net income (loss), net of participating securities | $							$ 1,512	$ (15,675)	$ (985)
Weighted-average number of basic shares (in shares)							935,000,000.0	918,700,000	809,500,000
Basic earnings (loss) per common share (in dollars per share) | $ / shares							$ 1.62	$ (17.06)	$ (1.22)
Diluted earnings (loss) per common share
Net income (loss), net of participating securities | $							$ 1,512	$ (15,675)	$ (985)
Weighted-average number of basic shares (in shares)							935,000,000.0	918,700,000	809,500,000
Dilutive securities (in shares)							23,800,000	0	0
Total diluted weighted- average common shares (in shares)							958,800,000	918,700,000	809,500,000
Diluted earnings (loss) per common share (in dollars per share) | $ / shares							$ 1.58	$ (17.06)	$ (1.22)
Antidilutive securities excluded from computation of earnings per share (in shares)							87,000,000	203,000,000
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Total accumulated other comprehensive income (loss) | $		$ 20,327					$ 20,327	$ 18,573	$ 34,232			$ 21,330
Anadarko Petroleum Corporation | Series A preferred stock
Common stock issuances
Issued as part of the acquisition (in shares)	100,000
PREFERRED STOCK
Issued as part of the acquisition (in shares)	100,000
Liquidation preference (in dollars per share) | $ / shares	$ 105,000
Dividend rate	8.00%
Dividend rate for unpaid amounts	9.00%
Common stock
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Total accumulated other comprehensive income (loss) | $		217					217	216	209			179
Common stock | Anadarko Petroleum Corporation
Common stock issuances
Issued as part of the acquisition (in shares)						2,000,000,000,000
PREFERRED STOCK
Issued as part of the acquisition (in shares)						2,000,000,000,000
Warrant | Common stock
COMMON STOCK WARRANTS
Warrant, rate conversion											0.125
Warrants issued (in shares)										116,000,000
Exercise price of warrants (in dollars per share) | $ / shares										$ 22.00
Fair value of warrant, reclassification | $										$ 767
Foreign currency translation adjustments
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Total accumulated other comprehensive income (loss) | $		(8)					(8)	(6)
Losses on derivatives
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Total accumulated other comprehensive income (loss) | $		(104)					(104)	(119)
Pension and postretirement adjustments
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Total accumulated other comprehensive income (loss) | $		(96)					(96)	(163)
Accumulated other comprehensive income (loss)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Total accumulated other comprehensive income (loss) | $		$ (208)					$ (208)	$ (288)	$ (221)			$ (172)