STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common stock issuances
Balance at the beginning of the year (in shares)	893,469,000	892,215,000	891,360,000
Issued (in shares)	1,628,000	1,252,000	843,000
Options exercised and other, net (in shares)	19,000	2,000	12,000
Balance at the end of the year (in shares)	895,116,000	893,469,000	892,215,000
TREASURY STOCK
Share repurchase program, authorized shares	185,000,000
Share repurchase program, shares yet to be repurchased	46,900,000
Shares purchased under share repurchase program	16,900,000	0	0
Share repurchase program, average cost per share of shares repurchased during period (in dollars per share)	$ 74.92
Treasury stock, shares (in shares)	145,726,051	128,364,195	128,000,000
NONREDEEMABLE PREFERRED STOCK
Preferred stock, authorized shares (in shares)	50,000,000	50,000,000	50,000,000
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00	$ 1.00
Preferred stock, shares outstanding (in shares)	0	0	0
Basic earnings per common share
Income (loss) from continuing operations	$ 4,131	$ 1,311	$ (1,002)
Income (loss) from continuing operations attributable to common stock	4,131	1,311	(1,002)
Income from discontinued operations	0	0	428
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	4,131	1,311	(574)
Less: Net income allocated to participating securities	(17)	(6)	0
Net income (loss), net of participating securities	$ 4,114	$ 1,305	$ (574)
Weighted average number of basic shares (in shares)	761,700,000	765,100,000	763,800,000
Basic earnings (loss) per common share (in dollars per share)	$ 5.40	$ 1.71	$ (0.75)
Diluted EPS
Net income (loss), net of participating securities	$ 4,114	$ 1,305	$ (574)
Weighted average number of basic shares (in shares)	761,700,000	765,100,000	763,800,000
Dilutive securities (in shares)	1,600,000	800,000	0
Total diluted weighted average common shares (in shares)	763,300,000	765,900,000	763,800,000
Diluted earnings (loss) per common share (in dollars per share)	$ 5.39	$ 1.70	$ (0.75)
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss	$ (172)	$ (258)
Foreign currency translation adjustments
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss	(7)	(7)
Unrealized gains on derivatives
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss	5	0
Pension and postretirement adjustments
ACCUMULATED OTHER COMPREHENSIVE LOSS
Accumulated other comprehensive loss	$ (170)	$ (251)