Long-Term Debt And Borrowing Arrangements (Summary Of Outstanding Debt Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Within 1 year	$ 254
Between 1 and 2 years	871
Between 2 and 3 years	908
Between 3 and 4 years	214
Between 4 and 5 years	367
Thereafter	2,569
Long-term debt outstanding	5,183	$ 5,053
Securitized Vacation Ownership Debt [Member]
Debt Instrument [Line Items]
Within 1 year	210
Between 1 and 2 years	223
Between 2 and 3 years	432
Between 3 and 4 years	201
Between 4 and 5 years	208
Thereafter	836
Secured Debt	2,110	2,165
Other [Member]
Debt Instrument [Line Items]
Within 1 year	44
Between 1 and 2 years	648
Between 2 and 3 years	476
Between 3 and 4 years	13
Between 4 and 5 years	159
Thereafter	1,733
Total long-term debt	$ 3,073	$ 2,888