STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Millions		1 Months Ended						12 Months Ended
	Aug. 08, 2019 $ / shares shares	Jan. 31, 2021 USD ($) shares	Oct. 31, 2020 USD ($)	Jul. 31, 2020 shares	Jun. 30, 2020	Apr. 30, 2020 shares	Mar. 31, 2020	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Aug. 03, 2020 USD ($) $ / shares shares	Jun. 26, 2020 $ / shares shares	Dec. 31, 2017 USD ($)
Common stock issuances
Balance at the beginning of the year (in shares)		1,080,565,000						1,044,435,000	895,116,000	893,469,000
Issued (in shares)				11,600,000		17,300,000		36,130,000	3,188,000	1,628,000
Options exercised and other, net (in shares)									146,131,000	19,000
Issued as part of the Acquisition (in shares)								0
Balance at the end of the year (in shares)								1,080,565,000	1,044,435,000	895,116,000
TREASURY STOCK
Share repurchase program, authorized shares								185,000,000
Share repurchase program, shares yet to be repurchased								44,200,000
Shares purchased under share repurchase program								0	2,700,000	16,900,000
Share repurchase program, average cost per share of shares repurchased during period (in dollars per share) | $ / shares									$ 66.94	$ 74.92
Treasury stock, shares (in shares)								149,051,634	150,323,151	145,700,000
NONREDEEMABLE PREFERRED STOCK
Issued as part of the Acquisition (in shares)								0
Volume weighted average price					90.00%		90.00%
Volume weighted average price calculation period					10 days		10 days
Preferred stock dividends paid | $			$ 200
Preferred stock, shares outstanding (in shares)								100,000	100,000	0
Preferred stock issued (in shares)								100,000	100,000
Basic earnings per common share
Income (loss) from continuing operations | $								$ (13,533)	$ (507)	$ 4,131
Loss from discontinued operations, net of tax | $								(1,298)	(15)	0
NET (LOSS) INCOME | $								(14,831)	(522)	4,131
Less: Net loss attributable to noncontrolling interest | $								0	(145)	0
Less: Preferred stock dividends | $								(844)	(318)	0
NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS | $								(15,675)	(985)	4,131
Less: Net income allocated to participating securities | $								0	0	(17)
Net income (loss), net of participating securities | $								$ (15,675)	$ (985)	$ 4,114
Weighted average number of basic shares (in shares)								918,700,000	809,500,000	761,700,000
Basic earnings (loss) per common share (in dollars per share) | $ / shares								$ (17.06)	$ (1.22)	$ 5.40
Diluted EPS
Net income (loss), net of participating securities | $								$ (15,675)	$ (985)	$ 4,114
Weighted average number of basic shares (in shares)								918,700,000	809,500,000	761,700,000
Dilutive securities (in shares)								0	0	1,600,000
Total diluted weighted average common shares (in shares)								918,700,000	809,500,000	763,300,000
Diluted earnings (loss) per common share (in dollars per share) | $ / shares								$ (17.06)	$ (1.22)	$ 5.39
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss | $								$ 18,573	$ 34,232	$ 21,330			$ 20,572
Subsequent Event
NONREDEEMABLE PREFERRED STOCK
Preferred stock dividends paid | $		$ 200
Anadarko Petroleum Corporation | Series A Preferred Stock
Common stock issuances
Issued as part of the Acquisition (in shares)	100,000
NONREDEEMABLE 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
NONREDEEMABLE PREFERRED STOCK
Warrants issued (in shares)												3,900,000
Exercise price of warrant (in dollars per share) | $ / shares												$ 59.624
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss | $								216	$ 209	179			179
Common Stock | Anadarko Petroleum Corporation
Common stock issuances
Issued as part of the Acquisition (in shares)									2,000,000
NONREDEEMABLE PREFERRED STOCK
Issued as part of the Acquisition (in shares)									2,000,000
Warrants issued (in shares)	80,000,000
Exercise price of warrant (in dollars per share) | $ / shares	$ 62.50
Foreign currency translation adjustments
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss | $								(6)	$ (7)
Losses on derivatives
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss | $								(119)	(122)
Pension and postretirement adjustments
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss | $								(163)	(92)
Accumulated Other Comprehensive Income (Loss)
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss | $								$ (288)	$ (221)	$ (172)			$ (258)
Warrant | Common Stock
NONREDEEMABLE PREFERRED STOCK
Warrant, rate conversion												0.125
Warrants issued (in shares)											116,000,000
Exercise price of warrant (in dollars per share) | $ / shares											$ 22.00
Fair value of warrant, reclassification | $											$ 767