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SEMPRA ENERGY - SHAREHOLDERS' EQUITY AND EARNINGS PER SHARE SEMPRA ENERGY COMMON STOCK OFFERINGS (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 26, 2019 | Jul. 13, 2018 | Mar. 08, 2018 | Jan. 09, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Issuances of common stock, net |  |  |  |  |  |  |  | $ 2,272 | $ 47 | $ 51
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  | 11,212,500 | 8,556,630 | 26,869,158 | 7,651,671 | 8,556,630 |  |  |  |
Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  | 9,750,000 |  | 23,364,486 |  |  |  |  |  |
Price of shares issued (in dollars per share) |  | $ 113.75 |  | $ 107.00 |  |  |  |  |  |
Price of shares issued net of underwriting discount (in dollars per share) |  | $ 111.87 |  | $ 105.07 |  |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  | 1,462,500 |  | 3,504,672 |  |  |  |  |  |
Issuances of common stock, net |  | $ 164 |  | $ 367 |  |  |  |  |  |
Underwriting discount |  |  |  | $ 8 |  |  |  |  |  |
Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Issuances of common stock, net |  |  | $ 900 |  | $ 800 | $ 900 |  |  |  |
Underwriting discount |  | $ 3 |  |  | $ 14 | $ 16 |  |  |  |
Subsequent Event [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Shares issuable under forward contracts | 16,906,185 |  |  |  |  |  |  |  |  |
Minimum [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Forward sales price (in usd per share) |  |  |  |  |  |  | $ 104.53 |  |  |
Maximum [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Forward sales price (in usd per share) |  |  |  |  |  |  | $ 105.18 |  |  |

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