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FAIR VALUE MEASUREMENTS - RECURRING FAIR VALUE MEASURES (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Alternative investment | $ 10 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 411 | $ 496
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 53 | 54
Nuclear decomissioning trusts - Municipal debt securities | 269 | 250
Nuclear decommissioning trusts - Other debt securities | 234 | 217
Nuclear decommissioning trusts - Total debt securities | 556 | 521
Total nuclear decommissioning trusts | 967 | 1,017
Assets fair value disclosure, total | 1,334 | 1,188
Liabilities fair value disclosure, total | 288 | 384
Fair Value, Measurements, Recurring [Member] | Interest Rate and Foreign Exchange Instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 2 | 7
Derivative liability | 150 | 217
Fair Value, Measurements, Recurring [Member] | Commodity contracts not subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 24 | 17
Effect of netting and allocation of collateral | 19 | 2
Derivative liability | 34 | 6
Fair Value, Measurements, Recurring [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 289 | 128
Effect of netting and allocation of collateral | 33 | 17
Derivative liability | 106 | 184
Effect of netting and allocation of collateral | (2) | (23)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 407 | 491
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 43 | 45
Nuclear decomissioning trusts - Municipal debt securities | 0 | 0
Nuclear decommissioning trusts - Other debt securities | 0 | 0
Nuclear decommissioning trusts - Total debt securities | 43 | 45
Total nuclear decommissioning trusts | 450 | 536
Assets fair value disclosure, total | 499 | 555
Liabilities fair value disclosure, total | 0 | 0
Fair Value, Measurements, 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 asset | 0 | 0
Derivative liability | 0 | 0
Fair Value, Measurements, 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 asset | 0 | 5
Effect of netting and allocation of collateral | 19 | 2
Derivative liability | 0 | 0
Fair Value, Measurements, 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 asset | 2 | 0
Effect of netting and allocation of collateral | 28 | 12
Derivative liability | 2 | 23
Effect of netting and allocation of collateral | (2) | (23)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 4 | 5
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 10 | 9
Nuclear decomissioning trusts - Municipal debt securities | 269 | 250
Nuclear decommissioning trusts - Other debt securities | 234 | 217
Nuclear decommissioning trusts - Total debt securities | 513 | 476
Total nuclear decommissioning trusts | 517 | 481
Assets fair value disclosure, total | 552 | 502
Liabilities fair value disclosure, total | 189 | 230
Fair Value, Measurements, 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 asset | 2 | 7
Derivative liability | 150 | 217
Fair Value, Measurements, 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 asset | 24 | 12
Effect of netting and allocation of collateral | 0 | 0
Derivative liability | 34 | 6
Fair Value, Measurements, 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 asset | 9 | 2
Effect of netting and allocation of collateral | 0 | 0
Derivative liability | 5 | 7
Effect of netting and allocation of collateral | 0 | 0
Fair Value, Measurements, 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 decomissioning trusts - Municipal debt securities | 0 | 0
Nuclear decommissioning trusts - Other debt securities | 0 | 0
Nuclear decommissioning trusts - Total debt securities | 0 | 0
Total nuclear decommissioning trusts | 0 | 0
Assets fair value disclosure, total | 283 | 131
Liabilities fair value disclosure, total | 99 | 154
Fair Value, Measurements, 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 asset | 0 | 0
Derivative liability | 0 | 0
Fair Value, Measurements, 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 asset | 0 | 0
Effect of netting and allocation of collateral | 0 | 0
Derivative liability | 0 | 0
Fair Value, Measurements, 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 asset | 278 | 126
Effect of netting and allocation of collateral | 5 | 5
Derivative liability | 99 | 154
Effect of netting and allocation of collateral | 0 | 0
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 411 | 496
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 53 | 54
Nuclear decomissioning trusts - Municipal debt securities | 269 | 250
Nuclear decommissioning trusts - Other debt securities | 234 | 217
Nuclear decommissioning trusts - Total debt securities | 556 | 521
Total nuclear decommissioning trusts | 967 | 1,017
Assets fair value disclosure, total | 1,280 | 1,159
Liabilities fair value disclosure, total | 100 | 172
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, Recurring [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 285 | 126
Effect of netting and allocation of collateral | 28 | 16
Derivative liability | 101 | 182
Effect of netting and allocation of collateral | (2) | (23)
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, Recurring [Member] | Interest rate instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 1 | 13
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 407 | 491
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 43 | 45
Nuclear decomissioning trusts - Municipal debt securities | 0 | 0
Nuclear decommissioning trusts - Other debt securities | 0 | 0
Nuclear decommissioning trusts - Total debt securities | 43 | 45
Total nuclear decommissioning trusts | 450 | 536
Assets fair value disclosure, total | 474 | 547
Liabilities fair value disclosure, total | 0 | 0
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, 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 asset | 1 | 0
Effect of netting and allocation of collateral | 23 | 11
Derivative liability | 2 | 23
Effect of netting and allocation of collateral | (2) | (23)
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest rate instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 0 | 0
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Nuclear decommissioning trusts - equity securities | 4 | 5
Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 10 | 9
Nuclear decomissioning trusts - Municipal debt securities | 269 | 250
Nuclear decommissioning trusts - Other debt securities | 234 | 217
Nuclear decommissioning trusts - Total debt securities | 513 | 476
Total nuclear decommissioning trusts | 517 | 481
Assets fair value disclosure, total | 523 | 481
Liabilities fair value disclosure, total | 1 | 18
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, 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 asset | 6 | 0
Effect of netting and allocation of collateral | 0 | 0
Derivative liability | 0 | 5
Effect of netting and allocation of collateral | 0 | 0
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest rate instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 1 | 13
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, 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 decomissioning trusts - Municipal debt securities | 0 | 0
Nuclear decommissioning trusts - Other debt securities | 0 | 0
Nuclear decommissioning trusts - Total debt securities | 0 | 0
Total nuclear decommissioning trusts | 0 | 0
Assets fair value disclosure, total | 283 | 131
Liabilities fair value disclosure, total | 99 | 154
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, 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 asset | 278 | 126
Effect of netting and allocation of collateral | 5 | 5
Derivative liability | 99 | 154
Effect of netting and allocation of collateral | 0 | 0
San Diego Gas and Electric Company [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest rate instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 0 | 0
Southern California Gas Company [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets fair value disclosure, total | 9 | 3
Liabilities fair value disclosure, total | 5 | 2
Southern California Gas Company [Member] | Fair Value, Measurements, Recurring [Member] | Commodity contracts subject to rate recovery [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 4 | 2
Effect of netting and allocation of collateral | 5 | 1
Derivative liability | 5 | 2
Southern California Gas Company [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets fair value disclosure, total | 6 | 1
Liabilities fair value disclosure, total | 0 | 0
Southern California Gas Company [Member] | Fair Value, Measurements, 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 asset | 1 | 0
Effect of netting and allocation of collateral | 5 | 1
Derivative liability | 0 | 0
Southern California Gas Company [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets fair value disclosure, total | 3 | 2
Liabilities fair value disclosure, total | 5 | 2
Southern California Gas Company [Member] | Fair Value, Measurements, 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 asset | 3 | 2
Effect of netting and allocation of collateral | 0 | 0
Derivative liability | 5 | 2
Southern California Gas Company [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets fair value disclosure, total | 0 | 0
Liabilities fair value disclosure, total | 0 | 0
Southern California Gas Company [Member] | Fair Value, Measurements, 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 asset | 0 | 0
Effect of netting and allocation of collateral | 0 | 0
Derivative liability | $ 0 | $ 0

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- 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, after the 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 not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 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 (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset. + 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 (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + 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 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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