SEMPRA - EQUITY AND EARNINGS PER COMMON SHARE - SERIES C PREFERRED STOCK (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 15, 2025	Sep. 10, 2025	Oct. 14, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Preferred Stock [Line Items]
Mandatorily redeemable preferred stock				$ 900		$ 900		$ 0	[1]
Preferred deemed dividends				11	$ 0	11	$ 0
Redemption of preferred stock				$ 900		$ 900
Series C Preferred Stock
Preferred Stock [Line Items]
Preferred stock, shares outstanding (in shares)		900,000						900,000
Preferred stock, shares issued (in shares)		900,000
Preferred stock redemption price (in dollars per share)		$ 1,000
Mandatorily redeemable preferred stock		$ 900
Preferred deemed dividends		$ 11
Series C Preferred Stock | Subsequent Event
Preferred Stock [Line Items]
Interest expense, accrued but undeclared dividends			$ 4
Redemption of preferred stock	$ 900
Shares redeemed during period (in shares)	900,000

[1] Derived from audited financial statements.