Leases - Schedule of Assets and Liabilities Lease (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease right-of-use assets	$ 245	$ 226
Operating lease liabilities, current	41	40
Operating lease liabilities, noncurrent	255	241
Operating lease liabilities	$ 296	$ 281
Operating lease, weighted average remaining lease term	7 years	7 years
Operating lease, weighted average discount rate, percent	5.55%	4.75%