Financing Receivables - Schedule of Financing Receivables (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross, non-current	$ 895	$ 908	$ 897
Allowance for financing receivables, non-current	(81)	(79)	(82)
Financing receivables, net, non-current	381	635	815
Financing receivables, gross, current	133	135	131
Allowance for financing receivables, current	(13)	(14)	(12)
Current portion of financing receivables, net	56	94	119
Financing receivables, net	934	950	934
Securitized Timeshare Financing Receivables [member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross, non-current	459	205
Allowance for financing receivables, non-current	(26)	(11)
Financing receivables, net, non-current	433	194
Financing receivables, gross, current	68	29
Allowance for financing receivables, current	(4)	(2)
Current portion of financing receivables, net	64	27
Financing receivables, net	497	221
Unsecuritized timeshare financing receivables [member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross, non-current	412	654	853
Allowance for financing receivables, non-current	(54)	(67)	(81)
Financing receivables, net, non-current	358	587	772
Financing receivables, gross, current	63	106	131
Allowance for financing receivables, current	(9)	(12)	(12)
Current portion of financing receivables, net	54	94	119
Financing receivables, net	412	681	891
Other financing receivables [member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross, non-current	24	49	44
Allowance for financing receivables, non-current	(1)	(1)	(1)
Financing receivables, net, non-current	23	48	43
Financing receivables, gross, current	2	0	0
Allowance for financing receivables, current	0	0	0
Current portion of financing receivables, net	2	0	0
Financing receivables, net	25	48	43
Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, net, non-current	814	829	815
Current portion of financing receivables, net	$ 120	$ 121	$ 119

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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) within one year from the reporting date (or the normal operating cycle, whichever is longer), consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

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A valuation allowance relating to a written agreement to receive money (at a specified future date(s) more than one year from the reporting date, consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

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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) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions 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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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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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. 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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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 more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. 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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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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