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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Capitalized Financing Costs Disclosure [Line Items] |  |  |
Total capitalized financing costs | $ 202 | $ 256 | $ 236
San Diego Gas and Electric Company [Member] |  |  |
Capitalized Financing Costs Disclosure [Line Items] |  |  |
Total capitalized financing costs | 82 | 85 | 62
Southern California Gas Company [Member] |  |  |
Capitalized Financing Costs Disclosure [Line Items] |  |  |
Total capitalized financing costs | $ 48 | $ 60 | $ 55

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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