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INCOME TAXES - CHANGES IN UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | $ (41) | $ (8) | $ (38)
San Diego Gas and Electric Company [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (6) | (6) | (11)
Expiration of statutes of limitations on tax assessments [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (1) | 0 | (2)
Expiration of statutes of limitations on tax assessments [Member] | San Diego Gas and Electric Company [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | 0 | 0 | (1)
Potential resolution of audit issues with various U.S. federal, state, and local non-U.S. taxing authorities [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (40) | (8) | (36)
Potential resolution of audit issues with various U.S. federal, state, and local non-U.S. taxing authorities [Member] | San Diego Gas and Electric Company [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | (6) | (6) | (10)
Potential resolution of audit issues with various U.S. federal, state, and local non-U.S. taxing authorities [Member] | Southern California Gas Company [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Possible change in unrecognized tax benefits in next 12 months | $ (2) | $ (2) | $ (25)

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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