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DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE IMPACT ON INCOME (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Derivative [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | $ 27 | $ 35
Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | 14 | 38
Not Designated as Hedging Instrument [Member] | Other Income [Member] | Foreign Exchange [Member] |  |
Derivative [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | 10 | 44
Not Designated as Hedging Instrument [Member] | Sales [Member] | Commodity Contracts not subject to rate recovery [Member] |  |
Derivative [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | 0 | (9)
Not Designated as Hedging Instrument [Member] | Cost of Electric Fuel and Purchased Power [Member] | Commodity Contracts Subject To Rate Recovery [Member] |  |
Derivative [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | 2 | 2
Not Designated as Hedging Instrument [Member] | Cost of Natural Gas [Member] | Commodity Contracts Subject To Rate Recovery [Member] |  |
Derivative [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | 2 | 1
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |
Derivative [Line Items] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (74) | 117
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0 | 16
Designated as Hedging Instrument [Member] | Interest Expense [Member] | Cash Flow Hedging [Member] | Interest rate and foreign exchange instruments [Member] |  |
Derivative [Line Items] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (3) | 54
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (1) | 2
Designated as Hedging Instrument [Member] | Other Income [Member] | Cash Flow Hedging [Member] | Interest rate and foreign exchange instruments [Member] |  |
Derivative [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 3 | 18
Designated as Hedging Instrument [Member] | Equity Earnings (Losses) [Member] | Cash Flow Hedging [Member] | Interest rate and foreign exchange instruments [Member] |  |
Derivative [Line Items] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (68) | 70
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (1) | (4)
Designated as Hedging Instrument [Member] | Sales [Member] | Cash Flow Hedging [Member] | Foreign Exchange [Member] |  |
Derivative [Line Items] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (3) | (7)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (1) | 0
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Cost of Electric Fuel and Purchased Power [Member] | Commodity Contracts Subject To Rate Recovery [Member] |  |
Derivative [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | 2 | 2
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member] |  |
Derivative [Line Items] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 0 | 1
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (1) | (3)
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Cost of Natural Gas [Member] | Commodity Contracts Subject To Rate Recovery [Member] |  |
Derivative [Line Items] |  |
Derivative, Gain (Loss) on Derivative, Net | $ 2 | $ 1

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