Commitments And Contingencies (Narrative) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 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	7,300
Other Receivables	586	$ 635
Realogy [Member]
Schedule Of Commitments And Contingencies [Line Items]
Other Receivables	40
Wyndham [Member]
Schedule Of Commitments And Contingencies [Line Items]
Other Receivables	$ 25