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Leases - Component of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease cost $ 14 $ 14
Short-term lease cost 1 0
Variable lease cost 2 3
Sublease income 0 0
Total lease cost $ 17 $ 17