Commitments And Contingencies (Narrative) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Schedule Of Commitments And Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 25
Loss Contingency, Range of Possible Loss, Portion Not Accrued	20
Purchase obligation over the next twelve months	7,400
Other Receivables	635	$ 627
Realogy [Member]
Schedule Of Commitments And Contingencies [Line Items]
Other Receivables	54
Wyndham [Member]
Schedule Of Commitments And Contingencies [Line Items]
Other Receivables	$ 33