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OTHER CONTINGENCIES AND COMMITMENTS (Interim Rate Relief Subject to Refund) (Details) $ in Millions | Sep. 21, 2021 USD ($) | Sep. 30, 2021 USD ($) catastrophicEvent | Oct. 23, 2020 USD ($) | Sep. 30, 2020 USD ($) | Aug. 07, 2019 USD ($) | Apr. 25, 2019 USD ($) | Mar. 30, 2018 USD ($) catastrophicEvent
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Loss Contingencies [Line Items] |  |  |  |  |  |  |
Expenses and capital expenditures, disallowed costs |  | $ 1,625 |  |  |  |  |
CEMA Interim Rate Relief |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Cost recovery |  |  |  |  |  | $ 373 |
Revised cost recovery, increase to revenue requirement |  |  |  |  | $ 669 |  |
CEMA Interim Rate Relief | Mid 2016 - Early 2017 |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Cost recovery |  |  |  |  |  |  | $ 183
Number of catastrophic events | catastrophicEvent |  |  |  |  |  |  | 7
CEMA Interim Rate Relief | 2016 to 2017 |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Cost recovery |  |  |  |  |  |  | $ 405
WMCE Interim Rate Relief |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of catastrophic events | catastrophicEvent |  | 10 |  |  |  |  |
Expenses and capital expenditures, disallowed costs |  |  |  | $ 1,180 |  |  |
Expenses and capital expenditures, capital expenditures |  |  |  | 801 |  |  |
Cost recovery, increase to revenue requirement |  |  |  | $ 1,280 |  |  |
Capital expenditures for future recovery |  |  | $ 447 |  |  |  |
Interim revenue requirement | $ 447 |  |  |  |  |  |
Loss Contingency, Amortization Period | 17 months |  |  |  |  |  |
Additional revenue requirement | $ 591 |  |  |  |  |  |
Additional amortization period | 24 months |  |  |  |  |  |
WMCE Interim Rate Relief | Fire hazard prevention memorandum account |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Cost recovery |  | $ 293 |  |  |  |  |
WMCE Interim Rate Relief | Fire risk and wildfire mitigation memorandum account |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Cost recovery |  | 740 |  |  |  |  |
WMCE Interim Rate Relief | Catastrophic event memorandum account |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Cost recovery |  | $ 251 |  |  |  |  |

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