GENERAL INFORMATION AND OTHER FINANCIAL DATA - EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Income (loss) from continuing operations, net of income tax	$ 357	$ (585)	$ 917	$ (255)
(Earnings) losses attributable to noncontrolling interests	(37)	2	(69)	26
Mandatory convertible preferred stock dividends	(35)	(25)	(71)	(53)
Earnings (losses) from continuing operations attributable to common shares	284	(609)	776	(283)
Income from discontinued operations, net of income tax	78	55	36	83
Earnings from discontinued operations attributable to common shares	70	48	19	69
Earnings (losses) attributable to common shares	$ 354	$ (561)	$ 795	$ (214)
Weighted-average common shares outstanding for basic EPS	274,987,000	265,837,000	274,831,000	261,906,000
Dilutive effect of stock options, RSAs and RSUs (in shares)	1,541,000	0	1,255,000	0
Dilutive effect of common stock forward shares (in shares)	3,091,000	0	2,338,000	0
Weighted-average common shares outstanding for diluted EPS (in shares)	279,619,000	265,837,000	278,424,000	261,906,000
Earnings (losses) from continuing operations attributable to common shares (in usd per share)	$ 1.03	$ (2.29)	$ 2.82	$ (1.08)
Earnings from discontinued operations attributable to common shares (in usd per share)	0.26	0.18	0.07	0.26
Earnings (losses) attributable to common shares (in usd per share)	1.29	(2.11)	2.89	(0.82)
Earnings (losses) from continuing operations attributable to common shares (in usd per share)	1.01	(2.29)	2.78	(1.08)
Earnings from discontinued operations attributable to common shares (in usd per share)	0.25	0.18	0.07	0.26
Earnings (losses) from continuing operations attributable to common shares (n usd per share)	$ 1.26	$ (2.11)	$ 2.85	$ (0.82)
Vested RSUs included in basic WASO (in shares)	613,000	640,000	613,000	634,000
Non-qualified stock options granted (in shares)			261,075
Convertible Preferred Stock [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Antidilutive securities excluded from earnings per share (in shares)	17,442,705	15,296,567	17,442,705	15,296,567
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)			389,825
Service-based RSUs [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Equity awards, granted (in shares)			259,940
Sempra South American Utilities [Member] | Disposal Group Held-for-sale [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Income from discontinued operations, net of income tax	$ 78	$ 55	$ 36	$ 83
Earnings attributable to noncontrolling interests	(8)	(7)	(17)	(14)
Earnings from discontinued operations attributable to common shares	$ 70	$ 48	$ 19	$ 69
Stock Options and RSUs [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Antidilutive securities excluded from earnings per share (in shares)		986,000		931,000
Common Stock [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Antidilutive securities excluded from earnings per share (in shares)		714,000		746,000
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)	4,740	1,816	160,563	1,816