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Leases - Component of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Leases [Abstract]        
Operating lease cost $ 13 $ 14 $ 27 $ 28
Short-term lease cost 0 0 1 1
Variable lease cost 3 3 5 5
Total lease cost $ 16 $ 17 $ 33 $ 34