Leasing Arrangements - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Lessee Lease Description [Line Items]
Weighted average remaining operating lease term	15 years	16 years
Weighted average operating discount rate, percent	2.80%	2.60%
Right-of-use assets exchanged for new operating lease obligations	$ 23	$ 5
Operating lease right-of-use assets	124	126
Operating lease liabilities	133	$ 136
Schulke Mayr Gmb H [Member]
Lessee Lease Description [Line Items]
Operating lease right-of-use assets	1
Operating lease liabilities	$ 1
Real Estate [Member]
Lessee Lease Description [Line Items]
Lease liability percentage	80.00%	80.00%