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DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE INSTRUMENTS ON THE CONDENSED BALANCE SHEET (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Current assets: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | $ 68 | $ 80
Additional cash collateral for commodity contracts not subject to rate recovery | 25 | 19
Additional cash collateral for commodity contracts subject to rate recovery | 26 | 33
Total | 119 | 132
Other assets: Sundry [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | 238 | 235
Additional cash collateral for commodity contracts not subject to rate recovery | 0 | 0
Additional cash collateral for commodity contracts subject to rate recovery | 0 | 0
Total | 238 | 235
Current liabilities: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | (56) | (70)
Additional cash collateral for commodity contracts not subject to rate recovery | 0 | 0
Additional cash collateral for commodity contracts subject to rate recovery | 0 | 0
Total | (56) | (70)
Deferred credits and other liabilities: Deferred credits and other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | (209) | (218)
Additional cash collateral for commodity contracts not subject to rate recovery | 0 | 0
Additional cash collateral for commodity contracts subject to rate recovery | 0 | 0
Total | (209) | (218)
Designated as Hedging Instrument [Member] | Current assets: Other [Member] |  |
Derivatives designated as hedging instruments: |  |
Interest rate and foreign exchange instruments | 0 | 2
Designated as Hedging Instrument [Member] | Other assets: Sundry [Member] |  |
Derivatives designated as hedging instruments: |  |
Interest rate and foreign exchange instruments | 0 | 0
Designated as Hedging Instrument [Member] | Current liabilities: Other [Member] |  |
Derivatives designated as hedging instruments: |  |
Interest rate and foreign exchange instruments | (5) | (3)
Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member] |  |
Derivatives designated as hedging instruments: |  |
Interest rate and foreign exchange instruments | (146) | (147)
Not Designated as Hedging Instrument [Member] | Current assets: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Foreign exchange instruments | 12 |
Commodity contracts not subject to rate recovery | 58 | 153
Associated offsetting commodity contracts | (47) | (133)
Commodity contracts subject to rate recovery | 50 | 64
Associated offsetting commodity contracts | (5) | (6)
Associated offsetting cash collateral | 0 | 0
Not Designated as Hedging Instrument [Member] | Other assets: Sundry [Member] |  |
Derivatives not designated as hedging instruments: |  |
Foreign exchange instruments | 0 |
Commodity contracts not subject to rate recovery | 6 | 7
Associated offsetting commodity contracts | (2) | (3)
Commodity contracts subject to rate recovery | 236 | 233
Associated offsetting commodity contracts | (2) | (2)
Associated offsetting cash collateral | 0 | 0
Not Designated as Hedging Instrument [Member] | Current liabilities: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Foreign exchange instruments | 0 |
Commodity contracts not subject to rate recovery | (65) | (164)
Associated offsetting commodity contracts | 47 | 133
Commodity contracts subject to rate recovery | (41) | (42)
Associated offsetting commodity contracts | 5 | 6
Associated offsetting cash collateral | 3 | 0
Not Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Foreign exchange instruments | 0 |
Commodity contracts not subject to rate recovery | (5) | (6)
Associated offsetting commodity contracts | 2 | 3
Commodity contracts subject to rate recovery | (65) | (72)
Associated offsetting commodity contracts | 2 | 2
Associated offsetting cash collateral | 3 | 2
San Diego Gas and Electric Company [Member] | Current assets: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | 40 | 54
Additional cash collateral for commodity contracts subject to rate recovery | 25 | 28
Total | 65 | 82
San Diego Gas and Electric Company [Member] | Other assets: Sundry [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | 232 | 231
Additional cash collateral for commodity contracts subject to rate recovery | 0 | 0
Total | 232 | 231
San Diego Gas and Electric Company [Member] | Current liabilities: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | (29) | (32)
Additional cash collateral for commodity contracts subject to rate recovery | 0 | 0
Total | (29) | (32)
San Diego Gas and Electric Company [Member] | Deferred credits and other liabilities: Deferred credits and other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | (60) | (68)
Additional cash collateral for commodity contracts subject to rate recovery | 0 | 0
Total | (60) | (68)
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Current assets: Other [Member] |  |
Derivatives designated as hedging instruments: |  |
Interest rate instruments |  | 0
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Other assets: Sundry [Member] |  |
Derivatives designated as hedging instruments: |  |
Interest rate instruments |  | 0
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Current liabilities: Other [Member] |  |
Derivatives designated as hedging instruments: |  |
Interest rate instruments |  | (1)
San Diego Gas and Electric Company [Member] | Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member] |  |
Derivatives designated as hedging instruments: |  |
Interest rate instruments |  | 0
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Current assets: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Commodity contracts subject to rate recovery | 45 | 60
Associated offsetting commodity contracts | (5) | (6)
Associated offsetting cash collateral | 0 | 0
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Other assets: Sundry [Member] |  |
Derivatives not designated as hedging instruments: |  |
Commodity contracts subject to rate recovery | 234 | 233
Associated offsetting commodity contracts | (2) | (2)
Associated offsetting cash collateral | 0 | 0
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Current liabilities: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Commodity contracts subject to rate recovery | (37) | (37)
Associated offsetting commodity contracts | 5 | 6
Associated offsetting cash collateral | 3 | 0
San Diego Gas and Electric Company [Member] | Not Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Commodity contracts subject to rate recovery | (65) | (72)
Associated offsetting commodity contracts | 2 | 2
Associated offsetting cash collateral | 3 | 2
Southern California Gas Company [Member] | Current assets: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | 5 | 4
Additional cash collateral for commodity contracts subject to rate recovery | 1 | 5
Total | 6 | 9
Southern California Gas Company [Member] | Other assets: Sundry [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | 2 | 0
Additional cash collateral for commodity contracts subject to rate recovery | 0 | 0
Total | 2 | 0
Southern California Gas Company [Member] | Current liabilities: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | (4) | (5)
Additional cash collateral for commodity contracts subject to rate recovery | 0 | 0
Total | (4) | (5)
Southern California Gas Company [Member] | Deferred credits and other liabilities: Deferred credits and other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Net amounts presented on the balance sheet | 0 | 0
Additional cash collateral 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] |  |
Derivatives not designated as hedging instruments: |  |
Commodity contracts subject to rate recovery | 5 | 4
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Other assets: Sundry [Member] |  |
Derivatives not designated as hedging instruments: |  |
Commodity contracts subject to rate recovery | 2 | 0
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Current liabilities: Other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Commodity contracts subject to rate recovery | (4) | (5)
Southern California Gas Company [Member] | Not Designated as Hedging Instrument [Member] | Deferred credits and other liabilities: Deferred credits and other [Member] |  |
Derivatives not designated as hedging instruments: |  |
Commodity contracts subject to rate recovery | $ 0 | $ 0

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