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Components of Company's Vehicles (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Disclosure Components Of Companys Vehicles [Abstract]    
Rental vehicles $ 11,006car_RentalVehicles $ 10,234car_RentalVehicles
Less: Accumulated depreciation (1,465)car_AccumulatedDepreciation (1,411)car_AccumulatedDepreciation
Rental Vehicles Net, Total 9,541car_RentalVehiclesNet 8,823car_RentalVehiclesNet
Vehicles held for sale 674car_VehiclesHeldForSale 759car_VehiclesHeldForSale
Vehicles, net $ 10,215car_VehiclesNet $ 9,582car_VehiclesNet