Vacation Ownership Notes Receivable - Balances of VOI Notes Receivable by Brand and by FICO Score (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Total receivables	$ 715	$ 708
Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	385	384
Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	317	311
Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	13	13
700+ [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	363	357
700+ [Member] | Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	165	165
700+ [Member] | Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	191	185
700+ [Member] | Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	7	7
600-699 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	235	236
600-699 [Member] | Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	145	145
600-699 [Member] | Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	88	89
600-699 [Member] | Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	2	2
Less than 600 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	18	19
Less than 600 [Member] | Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	13	14
Less than 600 [Member] | Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	5	5
No Score [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	99	96
No Score [Member] | Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	62	60
No Score [Member] | Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	33	32
No Score [Member] | Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	$ 4	$ 4