Organization, Description of Business and Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2017
Business Acquisition [Line Items]
Excess tax benefits due to newly adopted guidance			$ 8
Increase to income	$ 141	$ 134	$ 250	$ 226
Increase to diluted earnings per share (in dollars per share)	$ 1.65	$ 1.52	$ 2.92	$ 2.52
Excess tax benefits from share-based payment arrangements			$ 0	$ 53
Retained Earnings
Business Acquisition [Line Items]
Increase to income			250
Cumulative effect of a change in accounting for share-based payments (note 1)					$ 5
Accounting Standards Update 2016-09, Excess Tax Benefit Component
Business Acquisition [Line Items]
Increase to income			$ 8
Increase to diluted earnings per share (in dollars per share)			$ 0.09
Accounting Standards Update 2016-09, Excess Tax Benefit Component | Retained Earnings
Business Acquisition [Line Items]
Cumulative effect of a change in accounting for share-based payments (note 1)					$ 5
Owned Equipment Rentals | Equipment Rental Revenue | Product Concentration Risk
Business Acquisition [Line Items]
Concentration risk, percentage			86.00%