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Held-for-Sale Treatment of the Clean Energy Businesses - Schedule of Carrying Amounts (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
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CURRENT ASSETS |  |  |
TOTAL CURRENT ASSETS | $ 7,162.0 |  | $ 0.0
CURRENT LIABILITIES |  |  |
TOTAL CURRENT LIABILITIES | 3,610.0 |  | $ 0.0
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses |  |  |
CURRENT ASSETS |  |  |
Cash and temporary cash investments | 25.0 |  |
Accounts receivable and other receivables - net allowance for uncollectible accounts | 319.0 |  |
Accrued unbilled revenue | 51.0 |  |
Fuel oil, gas in storage, materials and supplies, at average cost | 56.0 |  |
Restricted cash | 223.0 |  |
Fair value of derivatives assets | 84.0 |  |
Prepayments | 35.0 |  |
Other current assets | 24.0 |  |
TOTAL CURRENT ASSETS | 817.0 |  |
Non-utility property, net accumulated depreciation | 4,197.0 |  |
Construction work in progress | 522.0 |  |
NET PLANT | 4,719.0 |  |
OTHER NONCURRENT ASSETS |  |  |
Goodwill | 31.0 |  |
Intangible assets, less accumulated amortization | 1,222.0 |  |
Operating lease right-of-use asset | 266.0 |  |
Fair value of derivatives assets | 93.0 |  |
Other deferred charges and noncurrent assets | 14.0 |  |
TOTAL OTHER NONCURRENT ASSETS | 1,626.0 |  |
TOTAL ASSETS |  | $ 7,162.0 |
CURRENT LIABILITIES |  |  |
Long-term debt due within one year | 353.0 |  |
Term loan | 150.0 |  |
Accounts payable | 326.0 |  |
Operating lease liabilities | 33.0 |  |
Accrued Interest | 40.0 |  |
Other current liabilities | 71.0 |  |
TOTAL CURRENT LIABILITIES | 973.0 |  |
NONCURRENT LIABILITIES |  |  |
Asset retirement obligations | 77.0 |  |
Operating lease liabilities | 248.0 |  |
Other deferred credits and noncurrent liabilities | 20.0 |  |
TOTAL NONCURRENT LIABILITIES | 345.0 |  |
LONG-TERM DEBT | 2,292.0 |  |
TOTAL LIABILITIES | 3,610.0 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses | Consolidation, Eliminations |  |  |
OTHER NONCURRENT ASSETS |  |  |
Fair value of derivatives assets | $ 2.0 |  |

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