Vacation Ownership Notes Receivable - Balances of VOI Notes Receivable by Brand and by FICO Score (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Total receivables	$ 708	$ 701
700+ [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	357	352
600-699 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	236	224
Less than 600 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	19	21
No Score [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	96	104
Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	384	368
Sheraton [Member] | 700+ [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	165	157
Sheraton [Member] | 600-699 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	145	134
Sheraton [Member] | Less than 600 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	14	15
Sheraton [Member] | No Score [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	60	62
Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	311	316
Westin [Member] | 700+ [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	185	186
Westin [Member] | 600-699 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	89	88
Westin [Member] | Less than 600 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	5	6
Westin [Member] | No Score [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	32	36
Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	13	17
Other [Member] | 700+ [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	7	9
Other [Member] | 600-699 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	2	2
Other [Member] | No Score [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	$ 4	$ 6