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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - COLLECTION ALLOWANCES (Details) - Allowance, Credit Loss [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Allowance balance at January 1 | $ 33 | $ 35 | $ 32
Provisions for uncollectible accounts | 14 | 16 | 23
Write-offs of uncollectible accounts | (17) | (18) | (20)
Allowance balance at December 31 | 30 | 33 | 35
San Diego Gas and Electric Company [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Allowance balance at January 1 | 9 | 8 | 9
Provisions for uncollectible accounts | 9 | 8 | 6
Write-offs of uncollectible accounts | (7) | (7) | (7)
Allowance balance at December 31 | 11 | 9 | 8
Southern California Gas Company [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Allowance balance at January 1 | 16 | 21 | 17
Provisions for uncollectible accounts | 1 | 4 | 14
Write-offs of uncollectible accounts | (7) | (9) | (10)
Allowance balance at December 31 | $ 10 | $ 16 | $ 21

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