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Segment Information (Summary Of Segments Information) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Assets Under Vehicle Programs $ 13,256   $ 11,879
Document Fiscal Year Focus 2018    
Revenues $ 1,968 $ 1,839  
Revenues 1,968 1,839  
Adjusted EBITDA 2 (27)  
Non-vehicle related depreciation and amortization 61 63  
Interest expense 46 49  
Early extinguishment of debt (5) (3)  
Non-operational charges related to shareholder activist activity 9 0  
Transaction-related costs, net 4 3  
Charges for legal matter 0 13  
Restructuring and other related charges 6 7  
Income before income taxes (129) (165)  
Americas      
Segment Reporting Information [Line Items]      
Assets Under Vehicle Programs 10,200   9,000
Adjusted EBITDA 15 (20)  
International [Member]      
Segment Reporting Information [Line Items]      
Assets Under Vehicle Programs 3,100   $ 2,900
Revenues 620 525  
Adjusted EBITDA 3 7  
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Adjusted EBITDA (16) (14)  
Americas      
Segment Reporting Information [Line Items]      
Revenues $ 1,348 $ 1,314