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FAIR VALUE MEASUREMENTS - RECURRING FAIR VALUE MEASURES (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value Measured at Net Asset Value Per Share [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments at NAV | $ 7,000,000 |
Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 459,000,000 | $ 411,000,000
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 48,000,000 | 53,000,000
Nuclear decommissioning trusts - Municipal bonds | 279,000,000 | 269,000,000
Nuclear decommissioning trusts - Other securities | 238,000,000 | 234,000,000
Nuclear decommissioning trusts - Total debt securities | 565,000,000 | 556,000,000
Total nuclear decommissioning trusts | 1,024,000,000 | 967,000,000
Total Assets Measured at Fair Value | 1,381,000,000 | 1,334,000,000
Total LIabilities Measured at Fair Value | 265,000,000 | 288,000,000
Recurring [Member] | Interest rate and foreign exchange instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 12,000,000 | 2,000,000
Derivative liabilities | 151,000,000 | 150,000,000
Recurring [Member] | Commodity contracts not subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 15,000,000 | 24,000,000
Effect of netting and allocation of collateral | 25,000,000 | 19,000,000
Derivative liabilities | 21,000,000 | 34,000,000
Recurring [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 279,000,000 | 289,000,000
Effect of netting and allocation of collateral | 26,000,000 | 33,000,000
Derivative liabilities | 99,000,000 | 106,000,000
Effect of netting and allocation of collateral | (6,000,000) | (2,000,000)
Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 454,000,000 | 407,000,000
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 39,000,000 | 43,000,000
Nuclear decommissioning trusts - Municipal bonds | 0 | 0
Nuclear decommissioning trusts - Other securities | 0 | 0
Nuclear decommissioning trusts - Total debt securities | 39,000,000 | 43,000,000
Total nuclear decommissioning trusts | 493,000,000 | 450,000,000
Total Assets Measured at Fair Value | 539,000,000 | 499,000,000
Total LIabilities Measured at Fair Value | 0 | 0
Recurring [Member] | Level 1 [Member] | Interest rate and foreign exchange instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring [Member] | Level 1 [Member] | Commodity contracts not subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Effect of netting and allocation of collateral | 25,000,000 | 19,000,000
Derivative liabilities | 0 | 0
Recurring [Member] | Level 1 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 2,000,000
Effect of netting and allocation of collateral | 21,000,000 | 28,000,000
Derivative liabilities | 6,000,000 | 2,000,000
Effect of netting and allocation of collateral | (6,000,000) | (2,000,000)
Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 5,000,000 | 4,000,000
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 9,000,000 | 10,000,000
Nuclear decommissioning trusts - Municipal bonds | 279,000,000 | 269,000,000
Nuclear decommissioning trusts - Other securities | 238,000,000 | 234,000,000
Nuclear decommissioning trusts - Total debt securities | 526,000,000 | 513,000,000
Total nuclear decommissioning trusts | 531,000,000 | 517,000,000
Total Assets Measured at Fair Value | 566,000,000 | 552,000,000
Total LIabilities Measured at Fair Value | 176,000,000 | 189,000,000
Recurring [Member] | Level 2 [Member] | Interest rate and foreign exchange instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 12,000,000 | 2,000,000
Derivative liabilities | 151,000,000 | 150,000,000
Recurring [Member] | Level 2 [Member] | Commodity contracts not subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 15,000,000 | 24,000,000
Effect of netting and allocation of collateral | 0 | 0
Derivative liabilities | 21,000,000 | 34,000,000
Recurring [Member] | Level 2 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 8,000,000 | 9,000,000
Effect of netting and allocation of collateral | 0 | 0
Derivative liabilities | 4,000,000 | 5,000,000
Effect of netting and allocation of collateral | 0 | 0
Recurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 0 | 0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 0 | 0
Nuclear decommissioning trusts - Municipal bonds | 0 | 0
Nuclear decommissioning trusts - Other securities | 0 | 0
Nuclear decommissioning trusts - Total debt securities | 0 | 0
Total nuclear decommissioning trusts | 0 | 0
Total Assets Measured at Fair Value | 276,000,000 | 283,000,000
Total LIabilities Measured at Fair Value | 89,000,000 | 99,000,000
Recurring [Member] | Level 3 [Member] | Interest rate and foreign exchange instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring [Member] | Level 3 [Member] | Commodity contracts not subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Effect of netting and allocation of collateral | 0 | 0
Derivative liabilities | 0 | 0
Recurring [Member] | Level 3 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 271,000,000 | 278,000,000
Effect of netting and allocation of collateral | 5,000,000 | 5,000,000
Derivative liabilities | 89,000,000 | 99,000,000
Effect of netting and allocation of collateral | 0 | 0
San Diego Gas and Electric Company [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 459,000,000 | 411,000,000
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 48,000,000 | 53,000,000
Nuclear decommissioning trusts - Municipal bonds | 279,000,000 | 269,000,000
Nuclear decommissioning trusts - Other securities | 238,000,000 | 234,000,000
Nuclear decommissioning trusts - Total debt securities | 565,000,000 | 556,000,000
Total nuclear decommissioning trusts | 1,024,000,000 | 967,000,000
Total Assets Measured at Fair Value | 1,321,000,000 | 1,280,000,000
Total LIabilities Measured at Fair Value | 89,000,000 | 100,000,000
San Diego Gas and Electric Company [Member] | Recurring [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 272,000,000 | 285,000,000
Effect of netting and allocation of collateral | 25,000,000 | 28,000,000
Derivative liabilities | 95,000,000 | 101,000,000
Effect of netting and allocation of collateral | (6,000,000) | (2,000,000)
San Diego Gas and Electric Company [Member] | Recurring [Member] | Interest rate instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities |  | 1,000,000
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 454,000,000 | 407,000,000
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 39,000,000 | 43,000,000
Nuclear decommissioning trusts - Municipal bonds | 0 | 0
Nuclear decommissioning trusts - Other securities | 0 | 0
Nuclear decommissioning trusts - Total debt securities | 39,000,000 | 43,000,000
Total nuclear decommissioning trusts | 493,000,000 | 450,000,000
Total Assets Measured at Fair Value | 513,000,000 | 474,000,000
Total LIabilities Measured at Fair Value | 0 | 0
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 1 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 1,000,000
Effect of netting and allocation of collateral | 20,000,000 | 23,000,000
Derivative liabilities | 6,000,000 | 2,000,000
Effect of netting and allocation of collateral | (6,000,000) | (2,000,000)
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 1 [Member] | Interest rate instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities |  | 0
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 5,000,000 | 4,000,000
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 9,000,000 | 10,000,000
Nuclear decommissioning trusts - Municipal bonds | 279,000,000 | 269,000,000
Nuclear decommissioning trusts - Other securities | 238,000,000 | 234,000,000
Nuclear decommissioning trusts - Total debt securities | 526,000,000 | 513,000,000
Total nuclear decommissioning trusts | 531,000,000 | 517,000,000
Total Assets Measured at Fair Value | 532,000,000 | 523,000,000
Total LIabilities Measured at Fair Value | 0 | 1,000,000
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 2 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 1,000,000 | 6,000,000
Effect of netting and allocation of collateral | 0 | 0
Derivative liabilities | 0 | 0
Effect of netting and allocation of collateral | 0 | 0
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 2 [Member] | Interest rate instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities |  | 1,000,000
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 0 | 0
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 0 | 0
Nuclear decommissioning trusts - Municipal bonds | 0 | 0
Nuclear decommissioning trusts - Other securities | 0 | 0
Nuclear decommissioning trusts - Total debt securities | 0 | 0
Total nuclear decommissioning trusts | 0 | 0
Total Assets Measured at Fair Value | 276,000,000 | 283,000,000
Total LIabilities Measured at Fair Value | 89,000,000 | 99,000,000
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 3 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 271,000,000 | 278,000,000
Effect of netting and allocation of collateral | 5,000,000 | 5,000,000
Derivative liabilities | 89,000,000 | 99,000,000
Effect of netting and allocation of collateral | 0 | 0
San Diego Gas and Electric Company [Member] | Recurring [Member] | Level 3 [Member] | Interest rate instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities |  | 0
Southern California Gas Company [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured at Fair Value | 8,000,000 | 9,000,000
Total LIabilities Measured at Fair Value | 4,000,000 | 5,000,000
Southern California Gas Company [Member] | Recurring [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 7,000,000 | 4,000,000
Effect of netting and allocation of collateral | 1,000,000 | 5,000,000
Derivative liabilities | 4,000,000 | 5,000,000
Southern California Gas Company [Member] | Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured at Fair Value | 1,000,000 | 6,000,000
Total LIabilities Measured at Fair Value | 0 | 0
Southern California Gas Company [Member] | Recurring [Member] | Level 1 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 1,000,000
Effect of netting and allocation of collateral | 1,000,000 | 5,000,000
Derivative liabilities | 0 | 0
Southern California Gas Company [Member] | Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured at Fair Value | 7,000,000 | 3,000,000
Total LIabilities Measured at Fair Value | 4,000,000 | 5,000,000
Southern California Gas Company [Member] | Recurring [Member] | Level 2 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 7,000,000 | 3,000,000
Effect of netting and allocation of collateral | 0 | 0
Derivative liabilities | 4,000,000 | 5,000,000
Southern California Gas Company [Member] | Recurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured at Fair Value | 0 | 0
Total LIabilities Measured at Fair Value | 0 | 0
Southern California Gas Company [Member] | Recurring [Member] | Level 3 [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Effect of netting and allocation of collateral | 0 | 0
Derivative liabilities | $ 0 | $ 0

X
- Definition Fair value assets measured on a recurring basis nuclear decommissioning trusts, total debt securities. + References No definition available. + Details
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=99392525&loc=SL7495116-110257 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value as of the balance sheet date of firm holdings in corporate stocks (common and preferred), stock options, warrants and any other financial instrument which represents, or provides the ability to obtain, ownership rights in a corporation. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Fair value of firm holdings in securities classified as other. Includes pledged and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by state and local governments and authorities. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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