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Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Depreciation expense $ (15) $ (15) $ (53) $ (43)