Leases (Summary of Financial Information Associated with Leases) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Operating lease right-of-use assets	$ 663	$ 669
Total leased assets	889	877
Current
Accrued expenses and other liabilities	178	178
Short-term debt and current maturities of long-term debt	56	58
Long-term
Operating lease liabilities	524	533
Long-term debt	85	69
Total lease liabilities	843	838
Rental equipment
Assets
Finance lease assets, gross	297	286
Less accumulated depreciation and amortization	(87)	(89)
Finance lease assets, net	210	197
Property and equipment, net
Assets
Less accumulated depreciation and amortization	(11)	(15)
Finance lease assets, net	16	11
Non-rental vehicles
Assets
Finance lease assets, gross	8	8
Buildings
Assets
Finance lease assets, gross	$ 19	$ 18