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FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Balance at beginning of period | $ 179,000,000 | $ (28,000,000) | $ (74,000,000) | $ 19,000,000
Realized and unrealized gains (losses) |  | 209,000,000 | 34,000,000 | (120,000,000)
Allocated transmission instruments |  | 10,000,000 | 6,000,000 | 8,000,000
Balance at end of period |  | 179,000,000 | (28,000,000) | (74,000,000)
Change in unrealized gains (losses) relating to instruments still held at the end of the period |  | 183,000,000 | 30,000,000 | (101,000,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements |  | 12,000,000 | (6,000,000) | $ (19,000,000)
San Diego Gas and Electric Company [Member] | Maximum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Congestion revenue rights (price per MWh) |  | 11.99 | 6.93 |
San Diego Gas and Electric Company [Member] | Minimum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Congestion revenue rights (price per MWh) |  | (7.25) | (11.88) |
San Diego Gas and Electric Company [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Congestion revenue rights (price per MWh) |  | 0.09 | (0.14) |
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Maximum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Congestion revenue rights (price per MWh) | 35.21 |  |  |
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Minimum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Congestion revenue rights (price per MWh) | (8.57) |  |  |
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Congestion revenue rights (price per MWh) | $ (2.94) |  |  |
Level 3 [Member] | San Diego Gas and Electric Company [Member] | Maximum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Market electricity forward price inputs (price per MWh) |  | 76.85 | 44.10 |
Level 3 [Member] | San Diego Gas and Electric Company [Member] | Minimum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Market electricity forward price inputs (price per MWh) |  | 22.20 | 22.55 |
Level 3 [Member] | San Diego Gas and Electric Company [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract] |  |  |  |
Market electricity forward price inputs (price per MWh) |  | $ 42.69 | $ 35.23 |

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