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Interest Rate, Credit, and Market Risk Exposures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Principal value of variable rate long term debt	$ 2,058
Securitization obligations	$ 205	$ 247
Company Owned Real Estate Brokerage Services | California [Member]
Concentration risk, geographic area, revenue	26.00%	27.00%	28.00%
Company Owned Real Estate Brokerage Services | New York [Member]
Concentration risk, geographic area, revenue	22.00%	23.00%	24.00%
Company Owned Real Estate Brokerage Services | Florida [Member]
Concentration risk, geographic area, revenue	9.00%	10.00%	10.00%
Minimum [Member]
Fixed interest rate of swaps	2.07%
Maximum [Member]
Fixed interest rate of swaps	2.89%
Interest rate swap contracts
Notional value of derivative instrument	$ 1,475
Interest rate swap contracts | Not Designated as Hedging Instruments | Other non-current liabilities
Fair value of interest rate derivative liabilities	33	$ 47
Foreign exchange contracts
Notional value of derivative instrument	29	33
Securitization obligations
Securitization obligations	$ 205	$ 247

X

- Definition

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

+ References

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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+ 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=64830801&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-URI http://asc.fasb.org/extlink&oid=66900655&loc=d3e34841-113949

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