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