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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Allowance for credit losses | $ 6 | $ 7
Unamortized transaction costs | 4 | 5
Unamortized discount and debt issuance costs | 326 | 289
Finance lease obligations | 1,346 | 1,343
Carrying amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term notes receivable | 330 | 318
Long-term amounts due to unconsolidated affiliates | 308 | 301
Total long-term debt | 27,657 | 24,513
Fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term notes receivable | 295 | 286
Long-term amounts due to unconsolidated affiliates | 269 | 263
Total long-term debt | 23,765 | 21,549
Fair value | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term notes receivable | 0 | 0
Long-term amounts due to unconsolidated affiliates | 0 | 0
Total long-term debt | 0 | 0
Fair value | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term notes receivable | 0 | 0
Long-term amounts due to unconsolidated affiliates | 269 | 263
Total long-term debt | 23,765 | 21,549
Fair value | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term notes receivable | 295 | 286
Long-term amounts due to unconsolidated affiliates | 0 | 0
Total long-term debt | 0 | 0
San Diego Gas and Electric Company |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unamortized discount and debt issuance costs | 90 | 70
Finance lease obligations | 1,234 | 1,256
San Diego Gas and Electric Company | Carrying amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 8,750 | 7,800
San Diego Gas and Electric Company | Fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 7,202 | 6,726
San Diego Gas and Electric Company | Fair value | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 0 | 0
San Diego Gas and Electric Company | Fair value | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 7,202 | 6,726
San Diego Gas and Electric Company | Fair value | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 0 | 0
Southern California Gas Company |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unamortized discount and debt issuance costs | 57 | 48
Finance lease obligations | 112 | 87
Southern California Gas Company | Carrying amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 6,759 | 6,059
Southern California Gas Company | Fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 5,953 | 5,538
Southern California Gas Company | Fair value | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 0 | 0
Southern California Gas Company | Fair value | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | 5,953 | 5,538
Southern California Gas Company | Fair value | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt | $ 0 | $ 0

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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