SEMPRA - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - COMMON STOCK ACTIVITY (Details) - shares	1 Months Ended	12 Months Ended
	May 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Common stock, shares authorized (in shares)		750,000,000	750,000,000	750,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares outstanding, January 1		288,470,244	291,712,925	273,769,513
Conversion of mandatory convertible preferred stock		18,037,745	0	0
Shares issued in IEnova exchange offer	12,306,777	12,306,777	0	0
Shares issued under forward sale agreements		0	0	16,906,185
RSUs vesting		686,916	896,839	463,012
Stock options exercised		50,671	4,400	52,540
Savings plan issuance		0	201,431	475,774
Common stock investment plan		0	42,955	199,253
Issuance of RSUs held in our Deferred Compensation Plan		102,238	103,552	59,470
Shares repurchased		(2,734,809)	(4,491,858)	(212,822)
Common shares outstanding, December 31		316,919,782	288,470,244	291,712,925