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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unamortized discount (net of premium) and debt issuance costs | $ 202 | $ 143
Capital lease obligations and build-to-suit | 1,419 | 877
Level 3 [Member] | Otay Mesa VIE [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 220 | 295
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term amounts due from unconsolidated affiliates | 688 | 598
Long-term amounts due to unconsolidated affiliates | 37 | 35
Total long-term debt | 22,067 | 17,138
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term amounts due from unconsolidated affiliates | 695 | 618
Long-term amounts due to unconsolidated affiliates | 35 | 32
Total long-term debt | 21,625 | 18,409
Fair Value [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term amounts due from unconsolidated affiliates | 0 | 0
Long-term amounts due to unconsolidated affiliates | 0 | 0
Total long-term debt | 0 | 817
Fair Value [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term amounts due from unconsolidated affiliates | 648 | 510
Long-term amounts due to unconsolidated affiliates | 35 | 32
Total long-term debt | 21,274 | 17,134
Fair Value [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term amounts due from unconsolidated affiliates | 47 | 108
Long-term amounts due to unconsolidated affiliates | 0 | 0
Total long-term debt | 351 | 458
San Diego Gas and Electric Company [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unamortized discount (net of premium) and debt issuance costs | 49 | 45
Capital lease obligations | 1,272 | 732
San Diego Gas and Electric Company [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 4,996 | 4,868
San Diego Gas and Electric Company [Member] | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 5,117 | 5,368
San Diego Gas and Electric Company [Member] | Fair Value [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 0 | 0
San Diego Gas and Electric Company [Member] | Fair Value [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 4,897 | 5,073
San Diego Gas and Electric Company [Member] | Fair Value [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 220 | 295
Southern California Gas Company [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unamortized discount (net of premium) and debt issuance costs | 32 | 24
Capital lease obligations | 3 | 1
Southern California Gas Company [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 3,459 | 3,009
Southern California Gas Company [Member] | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 3,505 | 3,192
Southern California Gas Company [Member] | Fair Value [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 0 | 0
Southern California Gas Company [Member] | Fair Value [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 3,505 | 3,192
Southern California Gas Company [Member] | Fair Value [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | $ 0 | $ 0

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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