Commitments And Contingencies (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		9 Months Ended
	Jun. 30, 2010	Oct. 31, 2009	Sep. 30, 2012
Schedule Of Commitments And Contingencies [Line Items]
Percentage of payment on defaulting party's obligation on assumed liabilities			50.00%
Claims paid on breach of contract	$ 3	$ 16
Lawsuit, filed year		2003
Purchase obligation over the next twelve months			3,400
Aggregate purchase obligations			163
Realogy [Member]
Schedule Of Commitments And Contingencies [Line Items]
Percentage of assumption of contingent and other corporate liabilities			62.50%
Percentage of proceeds from contingent corporate assets, entitled to receive			62.50%
Receivables due from former subsidiaries			68
Wyndham [Member]
Schedule Of Commitments And Contingencies [Line Items]
Percentage of assumption of contingent and other corporate liabilities			37.50%
Percentage of proceeds from contingent corporate assets, entitled to receive			37.50%
Receivables due from former subsidiaries			42
Realogy, Wyndham And Travelport [Member] | Real Estate Leases [Member]
Schedule Of Commitments And Contingencies [Line Items]
Maximum potential amount of future payments under guarantees			78
Liability recorded in connection with guarantees			$ 2