Leases Operating and Finance Lease Maturities Table (Details) $ in Millions	Sep. 30, 2019 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 47
Lessee, Operating Lease, Liability, Payments, Due Year Two	94
Lessee, Operating Lease, Liability, Payments, Due Year Three	74
Lessee, Operating Lease, Liability, Payments, Due Year Four	49
Lessee, Operating Lease, Liability, Payments, Due Year Five	27
Lessee, Operating Lease, Liability, Payments, Due after Year Five	166
Lessee, Operating Lease, Liability, Payments, Due	457
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	172
Operating Lease, Liability	285
Finance Lease, Liability, Payment, Due [Abstract]
Finance Lease, Liability, Payments, Remainder of Fiscal Year	3
Finance Lease, Liability, Payments, Due Year Two	13
Finance Lease, Liability, Payments, Due Year Three	11
Finance Lease, Liability, Payments, Due Year Four	11
Finance Lease, Liability, Payments, Due Year Five	11
Finance Lease, Liability, Payments, Due after Year Five	34
Finance Lease, Liability, Payment, Due	83
Finance Lease, Liability, Undiscounted Excess Amount	15
Finance Lease, Liability	$ 68