GENERAL INFORMATION AND OTHER FINANCIAL DATA - EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Income from continuing operations, net of income tax	$ 428	$ 653	$ 1,823	$ 1,570
Earnings attributable to noncontrolling interests	(22)	(52)	(191)	(121)
Preferred dividends	(48)	(36)	(121)	(107)
Preferred dividends of subsidiary	0	0	(1)	(1)
Earnings from continuing operations attributable to common shares for basic EPS	358	565	1,510	1,341
Add back dividends for dilutive mandatory convertible preferred stock	0	26	0	0
Earnings from continuing operations attributable to common shares for diluted EPS	358	591	1,510	1,341
(Loss) income from discontinued operations, net of income tax	(7)	256	1,850	292
Earnings attributable to noncontrolling interests	0	(8)	(10)	(25)
(Losses) earnings from discontinued operations attributable to common shares	(7)	248	1,840	267
Earnings attributable to common shares for basic EPS	351	813	3,350	1,608
Earnings attributable to common shares	$ 351	$ 839	$ 3,350	$ 1,608
Weighted-average common shares outstanding for basic EPS	289,490,000	277,360,000	291,771,000	275,684,000
Dilutive effect of stock options, RSAs and RSUs (in shares)	1,092,000	1,636,000	1,164,000	1,381,000
Dilutive effect of common stock forward shares (in shares)	0	3,555,000	0	2,744,000
Dilutive effect of mandatory convertible preferred stock (in shares)	0	13,238,000	0	0
Weighted-average common shares outstanding for diluted EPS (in shares)	290,582,000	295,789,000	292,935,000	279,809,000
Earnings (losses) from continuing operations attributable to common shares (in usd per share)	$ 1.23	$ 2.04	$ 5.17	$ 4.86
Earnings from discontinued operations attributable to common shares (in usd per share)	(0.02)	0.89	6.31	0.97
Earnings attributable to common shares (in usd per share)	1.21	2.93	11.48	5.83
Earnings (losses) from continuing operations attributable to common shares (in usd per share)	1.23	2.00	5.15	4.79
Earnings from discontinued operations attributable to common shares (in usd per share)	(0.02)	0.84	6.28	0.95
Earnings from continuing operations attributable to common shares (in usd per share)	$ 1.21	$ 2.84	$ 11.43	$ 5.74
Vested RSUs included in basic WASO (in shares)	535,000	618,000	536,000	615,000
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)	19,292,641	4,219,350	19,292,641	17,457,000
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)			163,475
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)	142,100	0	204,426	107,042