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SEMPRA ENERGY - SHAREHOLDERS' EQUITY AND EARNINGS PER SHARE - COMMON STOCK ACTIVITY (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share [Abstract] |  |  |
Common stock, shares authorized (in shares) | 750,000,000 | 750,000,000 |
Common stock par value (in dollars per share) | $ 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Common shares outstanding, January 1 | 251,358,977 | 250,152,514 | 248,298,080
Shares issued under forward sale agreements | 21,175,473 | 0 | 0
RSUs vesting | 509,042 | 362,022 | 1,363,555
Stock options exercised | 138,861 | 164,454 | 167,742
Savings plan issuance | 553,036 | 567,428 | 653,607
Common stock investment plan | 231,242 | 254,047 | 266,056
Issuance of RSUs held in our Deferred Compensation Plan | 3,357 | 7,811 | 0
Shares repurchased | (200,475) | (149,299) | (596,526)
Common shares outstanding, December 31 | 273,769,513 | 251,358,977 | 250,152,514

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