Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Balance at beginning of period	$ 5,168	$ 5,154	$ 5,058
Goodwill related to acquisitions	371	(2)	83
Foreign currency translation and other adjustments	(11)	16	13
Balance at end of period	5,528	5,168	5,154
Goodwill accumulated impairment loss	1,557	1,557	1,557
General rentals
Goodwill [Roll Forward]
Balance at beginning of period	4,368	4,362	4,342
Goodwill related to acquisitions	76	1	10
Foreign currency translation and other adjustments	1	5	10
Balance at end of period	4,445	4,368	4,362
Specialty
Goodwill [Roll Forward]
Balance at beginning of period	800	792	716
Goodwill related to acquisitions	295	(3)	73
Foreign currency translation and other adjustments	(12)	11	3
Balance at end of period	$ 1,083	$ 800	$ 792