Organization, Description of Business and Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jan. 01, 2017
Business Acquisition [Line Items]
Excess tax benefits due to newly adopted guidance				$ 8
Increase to income		$ 199	$ 187	$ 449	$ 413
Increase to diluted earnings per share (in dollars per share)		$ 2.33	$ 2.16	$ 5.26	$ 4.66
Excess tax benefits from share-based payment arrangements				$ 0	$ 53
Retained Earnings
Business Acquisition [Line Items]
Increase to income				$ 449
Cumulative effect of a change in accounting for share-based payments	[1]					$ 5
Owned Equipment Rentals | Equipment Rental Revenue | Product Concentration Risk
Business Acquisition [Line Items]
Concentration risk, percentage				86.00%
Accounting Standards Update 2016-09
Business Acquisition [Line Items]
Increase to income				$ 8
Increase to diluted earnings per share (in dollars per share)				$ 0.10
Accounting Standards Update 2016-09 | Retained Earnings
Business Acquisition [Line Items]
Cumulative effect of a change in accounting for share-based payments						$ 5

[1] The Accumulated Other Comprehensive Loss balance primarily reflects foreign currency translation adjustments.