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Leases - Component of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating lease cost $ 13 $ 14 $ 41 $ 40
Short-term lease cost 1 0 2 0
Variable lease cost 3 2 8 7
Sublease income 0 0 0 0
Total lease cost $ 17 $ 16 $ 51 $ 47