STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Aug. 08, 2019	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common stock issuances
Balance at the beginning of the year (in shares)		1,044,435,000	895,116,000	893,469,000	892,215,000
Issued (in shares)			3,188,000	1,628,000	1,252,000
Options exercised and other, net (in shares)				19,000	2,000
Issued as part of the Acquisition (in shares)			146,131,000
Balance at the end of the year (in shares)			1,044,435,000	895,116,000	893,469,000
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			2,700,000	16,900,000	0
Share repurchase program, average cost per share of shares repurchased during period (in dollars per share)			$ 66.94	$ 74.92
Treasury stock, shares (in shares)			150,323,151	145,726,051	128,400,000
NONREDEEMABLE PREFERRED STOCK
Preferred stock, authorized shares (in shares)			50,000,000
Preferred stock, par value (in dollars per share)			$ 1.00
Issued as part of the Acquisition (in shares)			146,131,000
Preferred stock, shares outstanding (in shares)			100,000	0	0
Preferred stock issued (in shares)			100,000
Basic earnings per common share
Income (loss) from continuing operations			$ (507)	$ 4,131	$ 1,311
Loss from discontinued operations, net of tax			(15)	0	0
NET INCOME (LOSS)			(522)	4,131	1,311
Less: Net income attributable to noncontrolling interest			(145)	0	0
Less: Preferred stock dividends			(318)	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS			(985)	4,131	1,311
Less: Net income allocated to participating securities			0	(17)	(6)
Net income (loss), net of participating securities			$ (985)	$ 4,114	$ 1,305
Weighted average number of basic shares (in shares)			809,500,000	761,700,000	765,100,000
Basic earnings (loss) per common share (in dollars per share)			$ (1.22)	$ 5.40	$ 1.71
Diluted EPS
Net income (loss), net of participating securities			$ (985)	$ 4,114	$ 1,305
Weighted average number of basic shares (in shares)			809,500,000	761,700,000	765,100,000
Dilutive securities (in shares)			0	1,600,000	800,000
Total diluted weighted average common shares (in shares)			809,500,000	763,300,000	765,900,000
Diluted earnings (loss) per common share (in dollars per share)			$ (1.22)	$ 5.39	$ 1.70
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss			$ 34,232	$ 21,330	$ 20,572	$ 21,497
Subsequent Event
NONREDEEMABLE PREFERRED STOCK
Payments of Ordinary Dividends, Preferred Stock and Preference Stock		$ 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)	$ 105,000
Dividend rate	8.00%
Dividend rate for unpaid amounts	9.00%
Common Stock
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss			$ 209	179	179	178
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
Foreign currency translation adjustments
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss			$ (7)	(7)
Unrealized gains (losses) on derivatives
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss			(122)	5
Pension and postretirement adjustments
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss			(92)	(170)
Accumulated Other Comprehensive Loss
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss			$ (221)	$ (172)	$ (258)	$ (266)