SEMPRA - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - EARNINGS (LOSSES) PER COMMON SHARE COMPUTATIONS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Income from continuing operations, net of income tax	$ 1,463	$ 2,255	$ 1,999
Earnings attributable to noncontrolling interests	(145)	(162)	(129)
Preferred dividends	(63)	(168)	(142)
Preferred dividends of subsidiary	(1)	(1)	(1)
Earnings from continuing operations attributable to common shares	1,254	1,924	1,727
Income from discontinued operations, net of income tax	0	1,850	363
Earnings attributable to noncontrolling interests	0	(10)	(35)
Earnings from discontinued operations attributable to common shares	0	1,840	328
Earnings attributable to common shares	1,254	3,764	2,055
Earnings attributable to common shares, diluted	$ 1,254	$ 3,764	$ 2,055
Weighted-average common shares outstanding for basic EPS (in shares)	311,755	291,077	277,904
Dilutive effect of stock options and RSUs (in shares)	752	1,175	1,585
Dilutive effect of common shares sold forward (in shares)	0	0	2,544
Dilutive effect of mandatory convertible preferred stock (in shares)	529	0	0
Weighted-average number of shares outstanding, diluted (in shares)	313,036	292,252	282,033
Earnings from continuing operations attributable to common shares	$ 4.03	$ 6.61	$ 6.22
Earnings (losses) from discontinued operations attributable to common shares	0	6.32	1.18
Basic earnings per common share (in shares)	4.03	12.93	7.40
Earnings from continuing operations (in dollars per share)	4.01	6.58	6.13
Earnings (losses) from discontinued operations (in dollars per share)	0	6.30	1.16
Diluted earnings per common share (in dollars per share)	$ 4.01	$ 12.88	$ 7.29
Fully vested RSUs included in the computation of EPS	453	537	617