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Acquisitions (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) real_estate_brokerage_operations	Dec. 31, 2015 USD ($) real_estate_brokerage_operations
Business Acquisition [Line Items]
Goodwill acquired	$ 72
Company Owned Brokerage Services
Business Acquisition [Line Items]
Goodwill acquired	52
Title and Settlement Services
Business Acquisition [Line Items]
Goodwill acquired	$ 20
NRT Business Combinations [Member] | Company Owned Brokerage Services
Business Acquisition [Line Items]
Number of business acquired (in real estate brokerage related operations) | real_estate_brokerage_operations	9	13
Cash consideration paid for acquisition	$ 74	$ 96
Liabilities established related to contingent consideration		13
Goodwill acquired	52	94
Other assets acquired	4	7
Other liabilities acquired	2	3
NRT Business Combinations [Member] | Customer-Related Intangible Assets | Company Owned Brokerage Services
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	20
NRT Business Combinations [Member] | Amortizable—Pendings and listings (f) | Company Owned Brokerage Services
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 6	10
NRT Business Combinations [Member] | Amortizable—Other (g) | Company Owned Brokerage Services
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 1
TRG Business Combinations [Member] | Title and Settlement Services
Business Acquisition [Line Items]
Number of business acquired (in real estate brokerage related operations) | real_estate_brokerage_operations	1	3
Cash consideration paid for acquisition	$ 24	$ 34
Liabilities established related to contingent consideration	10	37
Goodwill acquired	20	47
Other assets acquired	6	1
Other liabilities acquired	9
TRG Business Combinations [Member] | Indefinite life—Trademarks (b) | Title and Settlement Services
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	3	9
TRG Business Combinations [Member] | Indefinite life—Title plant shares (e) | Title and Settlement Services
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	7	1
TRG Business Combinations [Member] | Amortizable—Pendings and listings (f) | Title and Settlement Services
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	5	8
TRG Business Combinations [Member] | Amortizable—Other (g) | Title and Settlement Services
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 2	$ 5

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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