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Revenue Recognition Revenue Recognition - Deferred Revenue (Details) - USD ($)		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018
Deferred Revenue Arrangement [Line Items]
Royalty Rate		6.00%
Deferred Revenue		$ 106,000,000	$ 106,000,000	$ 114,000,000
Movement in Deferred Revenue [Roll Forward]
Additions during the period		110,000,000
Recognized as Revenue during the period		(118,000,000)
Ending Balance at June 30, 2018		106,000,000
Real Estate Franchise Services
Deferred Revenue Arrangement [Line Items]
Deferred Revenue	[1]	73,000,000	73,000,000	79,000,000
Deferred Sales Commission			25,000,000	24,000,000
Movement in Deferred Revenue [Roll Forward]
Additions during the period	[1]	59,000,000
Recognized as Revenue during the period	[1]	(65,000,000)
Ending Balance at June 30, 2018	[1]	73,000,000
Real Estate Franchise Services | Brand Marketing Fees
Deferred Revenue Arrangement [Line Items]
Deferred Revenue		7,000,000	7,000,000	13,000,000
Movement in Deferred Revenue [Roll Forward]
Ending Balance at June 30, 2018		7,000,000
Real Estate Franchise Services | Area Development Fees
Deferred Revenue Arrangement [Line Items]
Deferred Revenue		57,000,000	57,000,000	58,000,000
Movement in Deferred Revenue [Roll Forward]
Additions during the period	[1]	1,000,000
Recognized as Revenue during the period		(2,000,000)
Ending Balance at June 30, 2018		57,000,000
Company Owned Real Estate Brokerage Services
Deferred Revenue Arrangement [Line Items]
Deferred Revenue		15,000,000	15,000,000	17,000,000
Movement in Deferred Revenue [Roll Forward]
Additions during the period		6,000,000
Recognized as Revenue during the period		(8,000,000)
Ending Balance at June 30, 2018		15,000,000
Company Owned Real Estate Brokerage Services | New Development Business
Deferred Revenue Arrangement [Line Items]
Deferred Revenue		10,000,000	10,000,000	10,000,000
Movement in Deferred Revenue [Roll Forward]
Additions during the period		3,000,000
Recognized as Revenue during the period		(3,000,000)
Ending Balance at June 30, 2018		10,000,000
Relocation Services
Deferred Revenue Arrangement [Line Items]
Deferred Revenue		18,000,000	18,000,000	18,000,000
Movement in Deferred Revenue [Roll Forward]
Additions during the period		45,000,000
Recognized as Revenue during the period		(45,000,000)
Ending Balance at June 30, 2018		18,000,000
Relocation Services | Outsourcing Management Fees
Deferred Revenue Arrangement [Line Items]
Deferred Revenue		8,000,000	8,000,000	5,000,000
Movement in Deferred Revenue [Roll Forward]
Additions during the period		33,000,000
Recognized as Revenue during the period		(30,000,000)
Ending Balance at June 30, 2018		8,000,000
Relocation Services | Broker Network Fees
Deferred Revenue Arrangement [Line Items]
Deferred Revenue		4,000,000	$ 4,000,000	$ 8,000,000
Movement in Deferred Revenue [Roll Forward]
Additions during the period		1,000,000
Recognized as Revenue during the period		(5,000,000)
Ending Balance at June 30, 2018		$ 4,000,000
Franchise Rights | Real Estate Franchise Services
Deferred Revenue Arrangement [Line Items]
Amortization period		30 years
International Franchise Rights | Real Estate Franchise Services
Deferred Revenue Arrangement [Line Items]
Amortization period		25 years
Minimum | Company Owned Real Estate Brokerage Services
Deferred Revenue Arrangement [Line Items]
New Development Period		18 months
Minimum | Relocation Services
Deferred Revenue Arrangement [Line Items]
Average Length of a Move		3 months
Maximum | Company Owned Real Estate Brokerage Services
Deferred Revenue Arrangement [Line Items]
New Development Period		24 months
Maximum | Relocation Services
Deferred Revenue Arrangement [Line Items]
Average Length of a Move		6 months
[1] Revenues recognized include intercompany marketing fees paid by the Company Owned Real Estate Brokerage Services segment.

X

- Definition

The average number of months required to complete the transferee's move.

+ References

No definition available.

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- Definition

Average number of months from the contracted date to closing for new development closings.

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- Definition

Royalty Rate

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No definition available.

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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- Definition

Carrying amount of advanced commission payments.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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