Acquisitions and Divestitures (Acquisition) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 28, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Purchases of shares in equity method investment		$ 45	$ 45	$ 0
Goodwill			$ 1,256		$ 1,261
Penske Acquisition
Business Acquisition [Line Items]
Payments to acquire assets of certain Hertz-branded franchises	$ 87
Revenue earning vehicles	71
Property and equipment	6
Other intangible assets	9
Goodwill	1
Total	$ 87