Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Balance at beginning of period	$ 3,260	$ 3,243	$ 3,272
Goodwill related to acquisitions	805	9	16
Foreign currency translation and other adjustments	17	8	(45)
Balance at end of period	4,082	3,260	3,243
Goodwill accumulated impairment loss	1,557	1,557	1,557	$ 1,557
General rentals
Goodwill [Roll Forward]
Balance at beginning of period	2,797	2,786	2,804
Goodwill related to acquisitions	797	5	16
Foreign currency translation and other adjustments	13	6	(34)
Balance at end of period	3,607	2,797	2,786
Trench, power and pump
Goodwill [Roll Forward]
Balance at beginning of period	463	457	468
Goodwill related to acquisitions	8	4	0
Foreign currency translation and other adjustments	4	2	(11)
Balance at end of period	$ 475	$ 463	$ 457