Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2010 Internal Revenue Service (IRS)	Dec. 31, 2012 Internal Revenue Service (IRS)	Dec. 31, 2012 Internal Revenue Service (IRS) Maximum	Dec. 31, 2012 Pre-Separation taxes	Dec. 31, 2011 Vehicle Programs
Income Tax Disclosure [Line Items]
Federal net operating loss carryforwards net of valuation allowances	$ 14			$ 3,300
Operating loss carryforwards expiration period					2031
Foreign net operating loss carryforwards	305
Accumulated and undistributed earnings of foreign subsidiaries	683
Unrecognized tax benefits, decreases from non-current deferred income tax assets							230
Unrecognized tax benefits, decreases from deferred income tax liabilities							330
Unrecognized tax benefits, increases from income tax payable							65
Unrecognized tax benefits, increases from additional paid-in capital							30
Reductions in unrecognized tax benefits from settlements	1	129				128
Deferred income tax liabilities							128
Payments to the IRS and state tax authorities			144
Reimbursement by subsidiaries			89
Reduced income taxes payable and related receivables from Realogy and Wyndham			295
Reallocation of deferred taxes			$ (16)