Tangible Asset Impairments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2015	Jun. 30, 2014
Business Relationship
Revenue Earning Equipment [Line Items]
Asset impairment charges		$ 10
Held-for-sale
Revenue Earning Equipment [Line Items]
Asset impairment charges	$ 3
Held-for-sale | Selling, general and administrative expenses | Dollar Thrifty Headquarters
Revenue Earning Equipment [Line Items]
Asset impairment charges	6
Assets deemed to have no future use
Revenue Earning Equipment [Line Items]
Asset impairment charges	11
Assets deemed to have no future use | Customer contracts | Direct operating | Equipment
Revenue Earning Equipment [Line Items]
Asset impairment charges	4
Assets deemed to have no future use | Customer contracts | Other (income) expenses | Equipment
Revenue Earning Equipment [Line Items]
Asset impairment charges	$ 7