Rental Equipment (Details) - Sales of rental equipment - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Rental equipment	$ 16,445	$ 14,216
Less accumulated depreciation	(5,885)	(5,511)
Property and equipment, net	10,560	8,705
Increase (decrease) property, plant, and equipment		(1,082)
Net rental capital expenditures	$ 2,030	$ 103	$ 1,301