SEMPRA - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - NARRATIVE (Details) - USD ($)						12 Months Ended
	Feb. 25, 2022	Jan. 11, 2022	Nov. 17, 2021	Aug. 04, 2020	Jul. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 06, 2020	Sep. 11, 2007
Shares issued (in shares)						0	0	16,906,185
Issuances of common stock, net						$ 5,000,000	$ 11,000,000	$ 1,830,000,000
Subsequent Event
Maximum amount of shares that may yet be purchased	$ 1,500,000,000
Shares may yet be purchased (in shares)	21,104,486
Common Stock
Stock repurchase program, authorized amount									$ 2,000,000,000	$ 2,000,000,000
Number of shares authorized to be repurchased (in shares)									25,000,000	40,000,000
ASR program, amount prepaid					$ 500,000,000
Common shares repurchased (in shares)			2,422,758	4,089,375
Common shares repurchased, average price (in dollars per share)			$ 123.83	$ 122.27
Common stock acquired (in shares)			$ 300,000,000
Common Stock | Subsequent Event
ASR program, amount prepaid		$ 200,000,000
Common shares repurchased (in shares)		1,472,756
Common shares repurchased, average price (in dollars per share)		$ 135.80
Settlement of Forward Sale Contracts | Common Stock
Shares issued (in shares)								7,156,185
Issuances of common stock, net								$ 728,000,000
Payments of stock issuance costs								$ 13,000,000
Price of shares issued net of underwriting discount (in dollars per share)								$ 101.74
July 2018 Common Stock Offering | Common Stock
Shares issued (in shares)								9,750,000
Issuances of common stock, net								$ 1,066,000,000
Payments of stock issuance costs								$ 18,000,000
Price of shares issued net of underwriting discount (in dollars per share)								$ 109.33