Leases (Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Sublease income	$ (233)	$ (235)	$ (194)
Net lease cost	434	308	292
Short-term lease, cost	209	195	163
Cost of equipment rentals, excluding depreciation
Lessee, Lease, Description [Line Items]
Operating lease cost	582	494	432
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	12	11	11
Restructuring charge (2)
Lessee, Lease, Description [Line Items]
Operating lease cost	27	0	1
Depreciation of rental equipment
Lessee, Lease, Description [Line Items]
Finance lease cost	36	31	36
Non-rental depreciation and amortization
Lessee, Lease, Description [Line Items]
Finance lease cost	2	2	2
Interest expense, net
Lessee, Lease, Description [Line Items]
Interest on lease liabilities	$ 8	$ 5	$ 4