Leases Finance and Operating Leases, Liabilities, Maturities (Details) - USD ($)	Mar. 31, 2020	Oct. 01, 2019
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 32,000,000
Finance Lease, Liability, Payments, Due Next Twelve Months	6,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	50,000,000
Finance Lease, Liability, Payments, Due Year Two	6,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	44,000,000
Finance Lease, Liability, Payments, Due Year Three	2,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Four	31,000,000
Finance Lease, Liability, Payments, Due Year Four	1,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Five	23,000,000
Finance Lease, Liability, Payments, Due Year Five	0
Lessee, Operating Lease, Liability, Payments, Due Year Six	12,000,000
Finance Lease, Liability, Payments, Due Year Six	0
Lessee, Operating Lease, Liability, Payments, Due after Year Five	20,000,000
Finance Lease, Liability, Payments, Due after Year Five	0
Lessee, Operating Lease, Liability, Payments, Due	212,000,000
Finance Lease, Liability, Payment, Due	15,000,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(29,000,000)
Finance Lease, Liability, Undiscounted Excess Amount	(1,000,000)
Operating Lease, Liability	183,000,000	$ 194,000,000
Finance Lease, Liability	$ 14,000,000
Operating Lease, Weighted Average Remaining Lease Term	4 years 8 months 12 days
Finance Lease, Weighted Average Remaining Lease Term	2 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent	6.30%
Finance Lease, Weighted Average Discount Rate, Percent	6.10%