Lease Commitments - Schedule of Lease Balances on the Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease assets	$ 307	$ 261
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	198	77
Finance Lease, Right-of-Use Asset, Accumulated Amortization	(21)	(10)
Total Operating And Finance Lease, Right-Of-Use Asset	484	328
Operating lease liabilities, current	38	33
Finance lease liabilities, current	9	3
Operating lease liabilities, noncurrent	274	231
Finance lease liabilities, noncurrent	178	70
Total Operating And Finance Lease, Liability	$ 499	$ 337
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net	Property, plant and equipment, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other noncurrent liabilities	Other noncurrent liabilities