Leases (Summary of Financial Information Associated with Leases) (Details) $ in Millions	Sep. 30, 2019 USD ($)
Assets
Operating lease right-of-use assets	$ 650
Total leased assets	841
Current
Accrued expenses and other liabilities	174
Short-term debt and current maturities of long-term debt	38
Long-term
Operating lease liabilities	522
Long-term debt	82
Total lease liabilities	816
Rental equipment
Assets
Finance lease assets, gross	276
Less accumulated depreciation and amortization	(90)
Finance lease assets, net	186
Property and equipment, net
Assets
Less accumulated depreciation and amortization	(19)
Finance lease assets, net	5
Non-rental vehicles
Assets
Finance lease assets, gross	8
Buildings
Assets
Finance lease assets, gross	$ 16