Securitized and Non-Securitized Loans to Timeshare Owners, Loans on Nonaccrual Status (Detail) (Loans to timeshare owners, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment in loans on nonaccrual status	$ 128
Average investment in loans on non-accrual status	121
Nonsecuritized Notes Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment in loans on nonaccrual status	113
Average investment in loans on non-accrual status	113
Securitized Notes Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment in loans on nonaccrual status	15
Average investment in loans on non-accrual status	$ 8