GENERAL INFORMATION AND OTHER FINANCIAL DATA - EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Income from continuing operations, net of income tax		$ 528	$ 357	$ 1,395	$ 917
Earnings attributable to noncontrolling interests		(26)	(37)	(169)	(69)
Preferred dividends		(37)	(35)	(73)	(71)
Preferred dividends of subsidiary		(1)	(1)	(1)	(1)
Earnings from continuing operations attributable to common shares for basic EPS		464	284	1,152	776
Add back dividends for dilutive mandatory convertible preferred stock		0	0	52	0
Earnings from continuing operations attributable to common shares for diluted EPS		464	284	1,204	776
Income from discontinued operations, net of income tax		1,777	78	1,857	36
Earnings attributable to noncontrolling interests		(2)	(8)	(10)	(17)
Earnings from discontinued operations attributable to common shares		1,775	70	1,847	19
Earnings attributable to common shares for basic EPS		2,239	354	2,999	795
Earnings attributable to common shares		$ 2,239	$ 354	$ 3,051	$ 795
Weighted-average common shares outstanding for basic EPS		293,060,000	274,987,000	292,925,000	274,831,000
Dilutive effect of stock options, RSAs and RSUs (in shares)		1,095,000	1,541,000	1,199,000	1,255,000
Dilutive effect of common stock forward shares (in shares)		0	3,091,000	0	2,338,000
Dilutive effect of mandatory convertible preferred stock (in shares)		0	0	13,838,000	0
Weighted-average common shares outstanding for diluted EPS (in shares)		294,155,000	279,619,000	307,962,000	278,424,000
Earnings (losses) from continuing operations attributable to common shares (in usd per share)		$ 1.58	$ 1.03	$ 3.93	$ 2.82
Earnings from discontinued operations attributable to common shares (in usd per share)		6.06	0.26	6.31	0.07
Earnings attributable to common shares (in usd per share)		7.64	1.29	10.24	2.89
Earnings (losses) from continuing operations attributable to common shares (in usd per share)		1.58	1.01	3.91	2.78
Earnings from discontinued operations attributable to common shares (in usd per share)		6.03	0.25	6.00	0.07
Earnings from continuing operations attributable to common shares (in usd per share)		$ 7.61	$ 1.26	$ 9.91	$ 2.85
Vested RSUs included in basic WASO (in shares)		530,000	613,000	536,000	613,000
Non-qualified stock options granted (in shares)	154,860
Convertible Preferred Stock [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Antidilutive securities excluded from earnings per share (in shares)		18,450,579	17,442,705	4,612,645	17,442,705
Share-based Payment Arrangement, Option [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Exercisable period				3 years
Performance-based RSUs [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Equity awards, granted (in shares)	265,236
Service-based RSUs [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Equity awards, granted (in shares)	107,539
Stock options, RSAs and RSUs [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Antidilutive securities excluded from earnings per share (in shares)		216,922	4,740	235,589	160,563