Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Weighted average interest rate of debt outstanding.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) more than one year from the balance sheet date. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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The amount of borrowings received as a percentage of securitized collateral provided to obtain such borrowings.

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Outstanding Borrowings

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Long-Term Debt And Borrowing Arrangements (Securitized Debt) (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Oct. 05, 2017	Mar. 31, 2017	Dec. 31, 2016	Aug. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Weighted average interest rate	3.70%			3.60%		3.50%
Total debt, carrying amount	$ 6,007			$ 5,441
Secured debt	2,098
Collateralized gross vacation ownership contract receivables and related assets	3,277			$ 3,079
Sierra Timeshare 2017-1 Receivables Funding LLC [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 350
Weighted average interest rate			2.97%
Advance rate on securitized debt			90.00%
Total debt, carrying amount	209
Term Loan [Member]
Debt Instrument [Line Items]
Outstanding borrowings	$ 1,011
Sierra Timeshare Conduit Receivables Funding II LLC [Member]
Debt Instrument [Line Items]
Weighted average interest rate				3.70%
Credit facility maximum borrowing capacity					$ 650
Sierra Timeshare Conduit Receivables Funding III Llc [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 750
Securitized Vacation Ownership Debt [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.60%			3.60%		3.50%
Secured debt	$ 2,098			$ 2,141
Collateralized gross vacation ownership contract receivables and related assets	$ 2,680			$ 2,601