Notes Receivables - Past Due Balances of VOI Notes Receivable by Credit Quality Indicators (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	$ 7	$ 9
60-89 Days Past Due	5	6
>90 Days Past Due	37	47
Total Past Due	49	62
Current	686	697
Total Receivables	735	759
Sheraton [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	4	5
60-89 Days Past Due	3	3
>90 Days Past Due	20	26
Total Past Due	27	34
Current	331	321
Total Receivables	358	355
Westin [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	3	3
60-89 Days Past Due	2	2
>90 Days Past Due	10	17
Total Past Due	15	22
Current	334	345
Total Receivables	349	367
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due		1
60-89 Days Past Due		1
>90 Days Past Due	7	4
Total Past Due	7	6
Current	21	31
Total Receivables	$ 28	$ 37