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Leases - Component of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]        
Operating lease cost $ 14 $ 12 $ 28 $ 26
Short-term lease cost 0 0 1 0
Variable lease cost 3 2 5 5
Sublease income 0 0 0 0
Total lease cost $ 17 $ 14 $ 34 $ 31