Unrecognized Tax Benefits Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Unrecognized tax benefits, non-current income taxes payable	$ 40	$ 37
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	29	28
Unrecognized Tax Benefits	59	56	$ 63	$ 63
Non Avis Budget Car Rental Tax Contingencies
Income Taxes [Line Items]
Unrecognized Tax Benefits	$ 15	$ 15