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