Interest Rate, Credit, and Market Risk Exposures (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Principal value of variable rate long term debt	$ 2,502
Securitization obligations	$ 247	$ 269
Company Owned Real Estate Brokerage Services \| California [Member]
Concentration risk, geographic area, revenue	27.00%	28.00%	28.00%
Company Owned Real Estate Brokerage Services \| New York [Member]
Concentration risk, geographic area, revenue	23.00%	24.00%	24.00%
Company Owned Real Estate Brokerage Services \| Florida [Member]
Concentration risk, geographic area, revenue	10.00%	10.00%	10.00%
Minimum [Member]
Fixed interest rate of swaps	2.07%
Maximum [Member]
Fixed interest rate of swaps	2.89%
Swap [Member] \| Interest rate swap contracts
Notional value of derivative instrument	$ 1,475
Swap [Member] \| Interest rate swap contracts \| Not Designated as Hedging Instruments \| Other non-current liabilities
Fair value of interest rate derivative liabilities	47	$ 40
Securitization obligations
Securitization obligations	$ 247	$ 269

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Description of risks that arise due to concentrations of revenues in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

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- Definition

The principal value of variable interest rate long-term debt.

+ References

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Secured financing other than securities sold under agreements to repurchase and securities loaned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 15
-Paragraph 83
-URI http://asc.fasb.org/extlink&oid=39740004&loc=d3e34841-113949

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