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GENERAL INFORMATION AND OTHER FINANCIAL DATA - SHAREHOLDER'S EQUITY AND NONCONTROLLING INTEREST (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 07, 2019 | Jul. 31, 2018 | Jan. 31, 2018 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jul. 13, 2018 | Jan. 09, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance |  |  |  | $ 0 |  | $ 1,693 |  |
Proceeds from issuance |  |  |  | $ 11 |  | $ 1,278 |  |
Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued |  | 11,212,500 | 26,869,158 |  |  |  |  |
Shares issued (in usd per share) |  | $ 113.75 | $ 107.00 |  |  |  |  |
Shares issued net of underwriting discount (in usd per share) |  | $ 111.87 | $ 105.07 |  |  |  |  |
Proceeds from issuance |  |  | $ 1,270 |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance |  | $ 164 | $ 367 |  |  |  |  |
Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance |  |  |  |  | $ 800 |  |  |
Sempra Energy [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued |  |  | 17,250,000 |  |  |  |  |
Proceeds from issuance |  |  | $ 1,690 |  |  |  |  |
Liquidation price (in usd per share) |  |  |  |  |  |  |  | $ 100.00
Sempra Energy [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued |  | 5,750,000 |  |  |  |  |  |
Proceeds from issuance |  | $ 565 |  |  |  |  |  |
Liquidation price (in usd per share) |  |  |  |  |  |  | $ 100.00 |
Subsequent Event [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issuable under forward contracts | 16,906,185 |  |  |  |  |  |  |

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