Commitments And Contingencies (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule Of Commitments And Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 25
Loss Contingency, Range of Possible Loss, Portion Not Accrued	30
Purchase obligation over the next twelve months	5,200
Other Receivables	331	$ 246
Realogy [Member]
Schedule Of Commitments And Contingencies [Line Items]
Other Receivables	55
Wyndham [Member]
Schedule Of Commitments And Contingencies [Line Items]
Other Receivables	$ 33