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DERIVATIVE FINANCIAL INSTRUMENTS - NOTIONALS AMOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Cross-currency swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative liability | $ 306 | $ 408
Other foreign currency derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative liability | 1,158 | 345
Cash Flow Hedging [Member] | Interest rate instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative liability | 594 | 861
San Diego Gas and Electric Company [Member] | Cash Flow Hedging [Member] | Interest rate instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative liability | 142 | $ 295
OMEC LLC [Member] | Interest Rate Swap, maturing on October 31, 2019 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative liability | 159 |
OMEC LLC [Member] | Swaption [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative liability | $ 142 |
Minimum [Member] | Cross-currency swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Maturity Date | Dec. 31, 2019 | Dec. 31, 2018
Minimum [Member] | Other foreign currency derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Maturity Date | Dec. 31, 2019 | Dec. 31, 2018
Minimum [Member] | Cash Flow Hedging [Member] | Interest rate instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Maturity Date | Dec. 31, 2019 | Dec. 31, 2018
Minimum [Member] | San Diego Gas and Electric Company [Member] | Cash Flow Hedging [Member] | Interest rate instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Maturity Date | Dec. 31, 2019 | Dec. 31, 2018
Maximum [Member] | Cross-currency swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Maturity Date | Dec. 31, 2023 | Dec. 31, 2023
Maximum [Member] | Other foreign currency derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Maturity Date | Dec. 31, 2020 | Dec. 31, 2019
Maximum [Member] | Cash Flow Hedging [Member] | Interest rate instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Maturity Date | Dec. 31, 2032 | Dec. 31, 2032
Maximum [Member] | San Diego Gas and Electric Company [Member] | Cash Flow Hedging [Member] | Interest rate instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Maturity Date | Dec. 31, 2019 | Dec. 31, 2019

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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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