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DERIVATIVE FINANCIAL INSTRUMENTS - INCOME STATEMENT (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | $ 10 | $ (7) | $ (21)
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings |  |  | 1
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Expense [Member] | Interest rate instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings |  |  | 3
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Other Income [Member] | Interest rate instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings |  |  | (2)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | 68 | (8) | (21)
Pretax gain (loss) reclassified from AOCI into earnings | (13) | (23) | (33)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] | Interest rate and foreign exchange instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | 31 | 19 | (8)
Pretax gain (loss) reclassified from AOCI into earnings | 0 | 4 | (17)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Income [Member] | Interest rate and foreign exchange instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) reclassified from AOCI into earnings | 2 | 0 | 0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Gain on Sale of Assets [Member] | Interest rate instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | 0 | 0 | 0
Pretax gain (loss) reclassified from AOCI into earnings | (9) | 0 | 0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Equity Earnings [Member] | Interest rate and foreign exchange instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | 41 | (34) | (4)
Pretax gain (loss) reclassified from AOCI into earnings | (7) | (20) | (15)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Remeasurement of Equity Method Investment [Member] | Interest rate and foreign exchange instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | 0 | 0 | 0
Pretax gain (loss) reclassified from AOCI into earnings | 0 | 0 | (7)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Revenues: Energy-Related Businesses [Member] | Commodity Contracts Not Subject To Rate Recovery [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | 0 | 3 | (13)
Pretax gain (loss) reclassified from AOCI into earnings | 0 | (9) | 6
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Revenues: Energy-Related Businesses [Member] | Foreign exchange instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | (4) | 4 | 4
Pretax gain (loss) reclassified from AOCI into earnings | 1 | 2 | 0
Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 313 | 118 | (103)
Not Designated as Hedging Instrument [Member] | Other Income [Member] | Foreign exchange instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 3 | 49 | (32)
Not Designated as Hedging Instrument [Member] | Equity Earnings [Member] | Foreign exchange instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 0 | 1 | 3
Not Designated as Hedging Instrument [Member] | Revenues: Energy-Related Businesses [Member] | Commodity Contracts Not Subject To Rate Recovery [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 26 | 16 | (18)
Not Designated as Hedging Instrument [Member] | Operation And Maintenance [Member] | Commodity Contracts Not Subject To Rate Recovery [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 0 | 0 | 1
Not Designated as Hedging Instrument [Member] | Cost of Electric Fuel and Purchased Power [Member] | Commodity contracts subject to rate recovery [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 279 | 54 | (53)
Not Designated as Hedging Instrument [Member] | Cost of Natural Gas [Member] | Commodity contracts subject to rate recovery [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 5 | (2) | (4)
San Diego Gas and Electric Company [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 3 | 2 | 3
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] | Interest rate instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | 1 | (2) | (2)
Pretax gain (loss) reclassified from AOCI into earnings | (7) | (13) | (12)
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 Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 279 | 54 | (53)
Southern California Gas Company [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] | Interest rate instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pretax gain (loss) on derivative recognized in OCI | 0 | 0 | 0
Pretax gain (loss) reclassified from AOCI into earnings | (1) | 0 | (1)
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 5 | (2) | (3)
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Operation And Maintenance [Member] | Commodity Contracts Not Subject To Rate Recovery [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | 0 | 0 | 1
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Cost of Natural Gas [Member] | Commodity contracts subject to rate recovery [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative recognized in earnings | $ 5 | $ (2) | $ (4)

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