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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Beginning Balance | $ 2,877 | $ 2,553
Accretion expense | 121 | 109
Liabilities incurred | 7 | 34
Deconsolidation and reclassification | (61) | 0
Payments | (42) | (63)
Revisions | 71 | 244
Ending Balance | 2,973 | 2,877
San Diego Gas and Electric Company [Member] |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Beginning Balance | 839 | 830
Accretion expense | 39 | 39
Liabilities incurred | 0 | 17
Deconsolidation and reclassification | 0 | 0
Payments | (39) | (61)
Revisions | 35 | 14
Ending Balance | 874 | 839
Southern California Gas Company [Member] |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Beginning Balance | 1,953 | 1,659
Accretion expense | 78 | 66
Liabilities incurred | 0 | 0
Deconsolidation and reclassification | 0 | 0
Payments | (3) | (2)
Revisions | 35 | 230
Ending Balance | 2,063 | $ 1,953
Termoelectrica de Mexicali [Member] |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Reclassified from held for sale | 5 |
Sempra Renewables [Member] |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Reclassified to held for sale | 6 |
Sempra LNG & Midstream [Member] |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Reclassified to held for sale | 8 |
Sempra Renewables [Member] | Disposal Group Disposed of by Sale [Member] |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Deconsolidation and reclassification | $ 52 |

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- Definition Asset retirement obligations, reclassification. + References No definition available. + Details
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- Definition Asset Retirement Obligations Reclassification from Held for Sale + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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