Leases (Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Sublease income	$ (235)	$ (194)	$ (142)
Net lease cost	308	292	280
Short-term lease, cost	195	163	124
Cost of equipment rentals, excluding depreciation
Lessee, Lease, Description [Line Items]
Operating lease cost	494	432	366
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	11	11	10
Restructuring charge
Lessee, Lease, Description [Line Items]
Operating lease cost	0	1	9
Depreciation of rental equipment
Lessee, Lease, Description [Line Items]
Finance lease cost	31	36	31
Non-rental depreciation and amortization
Lessee, Lease, Description [Line Items]
Finance lease cost	2	2	1
Interest expense, net
Lessee, Lease, Description [Line Items]
Interest on lease liabilities	$ 5	$ 4	$ 5