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OTHER CONTINGENCIES AND COMMITMENTS - 2022 Cost of Capital Application (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Sep. 30, 2021
Loss Contingencies [Line Items] |  |
Annual cost of capital adjustment, indicator | 4.50% |
Annual cost of capital adjustment, basis point maximum | 100 |
Proposed cost of long-term debt | 4.14% |
Proposed return on preferred stock | 5.52% |
Proposed return on equity | 11.00% |
Annual cost of capital adjustment, indicator, basis point |  | 117
Decrease in jurisdictional revenue requirement | $ 163 |
Electric |  |
Loss Contingencies [Line Items] |  |
Decrease in jurisdictional revenue requirement | 99 |
Natural gas |  |
Loss Contingencies [Line Items] |  |
Decrease in jurisdictional revenue requirement | $ 64 |
Extraordinary Circumstances |  |
Loss Contingencies [Line Items] |  |
Cost of long-term debt | 4.17% |
Return on preferred equity | 5.52% |
Return on equity | 10.25% |
Not Extraordinary Circumstances |  |
Loss Contingencies [Line Items] |  |
Cost of long-term debt | 5.52% |
Return on preferred equity | 9.67% |
Return on equity | 4.15% |

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