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Components Of Vehicle Depreciation And Lease Charges (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Vehicle Depreciation and Lease Charges, Net [Line Items]      
Depreciation expense $ 1,840car_VehicleDepreciationExpense $ 1,678car_VehicleDepreciationExpense $ 1,438car_VehicleDepreciationExpense
Lease charges 163car_VehicleLeaseCharges 139car_VehicleLeaseCharges 130car_VehicleLeaseCharges
Gain on sale of vehicles, net (7)car_GainLossOnSaleOfVehicles (6)car_GainLossOnSaleOfVehicles (97)car_GainLossOnSaleOfVehicles
Vehicle depreciation and lease charges, net 1,996car_VehicleDepreciationAndLeaseChargesNet 1,811car_VehicleDepreciationAndLeaseChargesNet 1,471car_VehicleDepreciationAndLeaseChargesNet
Accounts Payable, Other, Current 222us-gaap_AccountsPayableOtherCurrent 260us-gaap_AccountsPayableOtherCurrent 284us-gaap_AccountsPayableOtherCurrent
Receivables due from former subsidiaries $ 352us-gaap_OtherReceivables $ 378us-gaap_OtherReceivables $ 439us-gaap_OtherReceivables