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FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at January 1 | $ 179,000,000 | $ (28,000,000) | $ 179,000,000 | $ (28,000,000)
Realized and unrealized gains | 5,000,000 | 4,000,000 |  |
Allocated transmission instruments | 0 | 3,000,000 |  |
Settlements | (2,000,000) | (19,000,000) |  |
Balance at March 31 | 182,000,000 | (40,000,000) |  | 179,000,000
Change in unrealized gains relating to instruments still held at the end of the period | $ 13,000,000 | $ (8,000,000) |  |
San Diego Gas and Electric Company [Member] | Minimum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Congestion revenue rights (in dollars per MWH) |  |  |  | (7.25)
San Diego Gas and Electric Company [Member] | Maximum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Congestion revenue rights (in dollars per MWH) |  |  |  | 11.99
San Diego Gas and Electric Company [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Congestion revenue rights (in dollars per MWH) |  |  |  | 0.09
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Minimum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Congestion revenue rights (in dollars per MWH) |  |  | (8.57) |
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Maximum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Congestion revenue rights (in dollars per MWH) |  |  | 35.21 |
Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Congestion revenue rights (in dollars per MWH) |  |  | (2.94) |
Level 3 [Member] | San Diego Gas and Electric Company [Member] | Minimum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Market electricity forward price inputs ( in dollars per MWH) |  |  |  | 20.00
Level 3 [Member] | San Diego Gas and Electric Company [Member] | Maximum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Market electricity forward price inputs ( in dollars per MWH) |  |  |  | 47.65
Level 3 [Member] | San Diego Gas and Electric Company [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Market electricity forward price inputs ( in dollars per MWH) |  |  |  | $ 35.42
Level 3 [Member] | Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Minimum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Market electricity forward price inputs ( in dollars per MWH) |  |  | 23.25 |
Level 3 [Member] | Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Maximum [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Market electricity forward price inputs ( in dollars per MWH) |  |  | 81.75 |
Level 3 [Member] | Subsequent Event [Member] | San Diego Gas and Electric Company [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Market electricity forward price inputs ( in dollars per MWH) |  |  | $ 42.49 |

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