Long-Term Debt And Borrowing Arrangements (Interest Expense Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Interest on long-term debt	$ 35	$ 35	$ 106	$ 94
Capitalized interest	1	2	4	5
Long-Term Debt Borrowings And Capitalized Interest [Member]
Debt Instrument [Line Items]
Interest expense incurred	34	33	102	89
Cash paid for interest			118	102
Securitized Vacation Ownership Debt [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 19	$ 18	55	55
Consumer Finance [Member]
Debt Instrument [Line Items]
Cash paid for interest			$ 38	$ 42