Leases (Summary of Financial Information Associated with Leases) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Operating lease right-of-use assets	$ 1,099	$ 819
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Short-term debt and current maturities of long-term debt	Short-term debt and current maturities of long-term debt
Total leased assets	$ 1,415	$ 1,049
Current
Accrued expenses and other liabilities	249	211
Short-term debt and current maturities of long-term debt	55	51
Long-term
Operating lease liabilities	$ 895	$ 642
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Long-term debt	$ 137	$ 72
Total lease liabilities	1,336	976
Property and equipment, net
Assets
Accumulated depreciation	(27)	(20)
Finance lease, right-of-use asset	47	13
Sales of rental equipment
Assets
Finance lease, right-of-use asset, before accumulated amortization	395	321
Accumulated depreciation	(126)	(104)
Finance lease, right-of-use asset	269	217
Non-rental vehicles
Assets
Finance lease, right-of-use asset, before accumulated amortization	8	8
Buildings
Assets
Finance lease, right-of-use asset, before accumulated amortization	$ 66	$ 25