SEMPRA - EQUITY AND EARNINGS PER COMMON SHARE - COMMON STOCK NARRATIVE (Details) $ / shares in Units, $ in Millions		1 Months Ended	9 Months Ended
	Aug. 02, 2023 shares	Nov. 30, 2023 $ / shares shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Nov. 06, 2024 USD ($) shares	Dec. 31, 2023 shares
Equity, Class of Treasury Stock [Line Items]
Stock split, conversion ratio	2
Stock dividend (in percent)	100.00%
Common stock, shares authorized (in shares)	1,125,000,000		1,125,000,000			1,125,000,000
Common stock
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, number of shares repurchased (in shares)			565,571	411,447
Common stock repurchased | $			$ 41	$ 32
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Sale of stock, shares available for future settlement					17,142,858
Public Stock Offering
Equity, Class of Treasury Stock [Line Items]
Sale of stock, number of shares issued in transaction		19,242,010
Common stock, par or stated value per share (usd per share) | $ / shares		$ 0
Sale of stock, price per share (usd per share) | $ / shares		70.00
Sale of stock, price per share, after underwriting discounts (usd per share) | $ / shares		$ 68.845
Public Stock Offering Pursuant to Forward Sale Agreement
Equity, Class of Treasury Stock [Line Items]
Sale of stock, number of shares issued in transaction		17,142,858
At The Market Program Offering | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Aggregate sales price | $					$ 3,000
Underwriting commission, percent					1.00%