Vacation Ownership Notes Receivable - Balances of VOI Notes Receivable by Brand and by FICO Score (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts Notes And Loans Receivable [Line Items]
Total receivables	$ 701	$ 719
Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	368	364
Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	316	334
Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	17	21
700+ [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	352	366
700+ [Member] | Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	157	156
700+ [Member] | Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	186	199
700+ [Member] | Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	9	11
600-699 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	224	224
600-699 [Member] | Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	134	130
600-699 [Member] | Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	88	91
600-699 [Member] | Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	2	3
Less than 600 [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	21	26
Less than 600 [Member] | Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	15	19
Less than 600 [Member] | Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	6	7
No Score [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	104	103
No Score [Member] | Sheraton [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	62	59
No Score [Member] | Westin [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	36	37
No Score [Member] | Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total receivables	$ 6	$ 7