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DERIVATIVE FINANCIAL INSTRUMENTS - BALANCE SHEET (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Current assets: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet $ 80,000,000 $ 47,000,000
Additional margin posted for commodity contracts not subject to rate recovery 19,000,000 2,000,000
Additional margin posted for commodity contracts subject to rate recovery 33,000,000 17,000,000
Total 132,000,000 66,000,000
Other assets: Sundry [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet 235,000,000 105,000,000
Additional margin posted for commodity contracts not subject to rate recovery 0 0
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total 235,000,000 105,000,000
Current liabilities: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet (70,000,000) (103,000,000)
Additional margin posted for commodity contracts not subject to rate recovery 0 0
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total (70,000,000) (103,000,000)
Deferred credits and other liabilities: Deferred credits and other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet (218,000,000) (281,000,000)
Additional margin posted for commodity contracts not subject to rate recovery 0 0
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total (218,000,000) (281,000,000)
Designated as Hedging Instrument [Member] | Current assets: Other [Member]    
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]    
Interest rate and foreign exchange instruments 2,000,000 5,000,000
Designated as Hedging Instrument [Member] | Other assets: Sundry [Member]    
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]    
Interest rate and foreign exchange instruments 0 2,000,000
Designated as Hedging Instrument [Member] | Current liabilities: Other [Member]    
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]    
Interest rate and foreign exchange instruments (3,000,000) (51,000,000)
Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member]    
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]    
Interest rate and foreign exchange instruments (147,000,000) (165,000,000)
Not Designated as Hedging Instrument [Member] | Current assets: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Foreign exchange instruments   0
Commodity contracts not subject to rate recovery 153,000,000 81,000,000
Associated offsetting commodity contracts not subject to rate recovery (133,000,000) (67,000,000)
Commodity contracts subject to rate recovery 64,000,000 28,000,000
Associated offsetting commodity contracts subject to rate recovery (6,000,000) 0
Associated cash collateral commodity contracts subject to rate recovery 0 0
Not Designated as Hedging Instrument [Member] | Other assets: Sundry [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Foreign exchange instruments   0
Commodity contracts not subject to rate recovery 7,000,000 8,000,000
Associated offsetting commodity contracts not subject to rate recovery (3,000,000) (5,000,000)
Commodity contracts subject to rate recovery 233,000,000 101,000,000
Associated offsetting commodity contracts subject to rate recovery (2,000,000) (1,000,000)
Associated cash collateral commodity contracts subject to rate recovery 0 0
Not Designated as Hedging Instrument [Member] | Current liabilities: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Foreign exchange instruments   (1,000,000)
Commodity contracts not subject to rate recovery (164,000,000) (72,000,000)
Associated offsetting commodity contracts not subject to rate recovery 133,000,000 67,000,000
Commodity contracts subject to rate recovery (42,000,000) (65,000,000)
Associated offsetting commodity contracts subject to rate recovery 6,000,000 0
Associated cash collateral commodity contracts subject to rate recovery 0 19,000,000
Not Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Foreign exchange instruments   0
Commodity contracts not subject to rate recovery (6,000,000) (6,000,000)
Associated offsetting commodity contracts not subject to rate recovery 3,000,000 5,000,000
Commodity contracts subject to rate recovery (72,000,000) (120,000,000)
Associated offsetting commodity contracts subject to rate recovery 2,000,000 1,000,000
Associated cash collateral commodity contracts subject to rate recovery 2,000,000 4,000,000
San Diego Gas and Electric Company [Member] | Current assets: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet 54,000,000 26,000,000
Additional margin posted for commodity contracts subject to rate recovery 28,000,000 16,000,000
Total 82,000,000 42,000,000
San Diego Gas and Electric Company [Member] | Other assets: Sundry [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet 231,000,000 100,000,000
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total 231,000,000 100,000,000
San Diego Gas and Electric Company [Member] | Current liabilities: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet (32,000,000) (54,000,000)
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total (32,000,000) (54,000,000)
San Diego Gas and Electric Company [Member] | Deferred credits and other liabilities: Deferred credits and other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet (68,000,000) (118,000,000)
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total (68,000,000) (118,000,000)
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Current assets: Other [Member]    
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]    
Interest rate and foreign exchange instruments 0 0
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Other assets: Sundry [Member]    
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]    
Interest rate and foreign exchange instruments 0 0
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Current liabilities: Other [Member]    
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]    
Interest rate and foreign exchange instruments (1,000,000) (10,000,000)
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member]    
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]    
Interest rate and foreign exchange instruments 0 (3,000,000)
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Current assets: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Commodity contracts subject to rate recovery 60,000,000 26,000,000
Associated offsetting commodity contracts subject to rate recovery (6,000,000) 0
Associated cash collateral commodity contracts subject to rate recovery 0 0
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Other assets: Sundry [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Commodity contracts subject to rate recovery 233,000,000 101,000,000
Associated offsetting commodity contracts subject to rate recovery (2,000,000) (1,000,000)
Associated cash collateral commodity contracts subject to rate recovery 0 0
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Current liabilities: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Commodity contracts subject to rate recovery (37,000,000) (63,000,000)
Associated offsetting commodity contracts subject to rate recovery 6,000,000 0
Associated cash collateral commodity contracts subject to rate recovery 0 19,000,000
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Commodity contracts subject to rate recovery (72,000,000) (120,000,000)
Associated offsetting commodity contracts subject to rate recovery 2,000,000 1,000,000
Associated cash collateral commodity contracts subject to rate recovery 2,000,000 4,000,000
Southern California Gas Company [Member] | Current assets: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet 4,000,000 2,000,000
Additional margin posted for commodity contracts subject to rate recovery 5,000,000 1,000,000
Total 9,000,000 3,000,000
Southern California Gas Company [Member] | Other assets: Sundry [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet 0 0
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total 0 0
Southern California Gas Company [Member] | Current liabilities: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet (5,000,000) (2,000,000)
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total (5,000,000) (2,000,000)
Southern California Gas Company [Member] | Deferred credits and other liabilities: Deferred credits and other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Net amount presented on balance sheet 0 0
Additional margin posted for commodity contracts subject to rate recovery 0 0
Total 0 0
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Current assets: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Commodity contracts subject to rate recovery 4,000,000 2,000,000
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Other assets: Sundry [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Commodity contracts subject to rate recovery 0 0
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Current liabilities: Other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Commodity contracts subject to rate recovery (5,000,000) (2,000,000)
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member]    
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]    
Commodity contracts subject to rate recovery $ 0 $ 0