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Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]          
Depreciation expense $ (26) $ (21) $ (87) $ (76) $ (77)