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Impairments (Details) - East - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Generating assets impairment loss | $ 43 | $ 20
Goodwill impairment loss |  | $ 130

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