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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% |

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