Acquisitions (Details) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2016 USD ($) real_estate_brokerage_operations	Dec. 31, 2015 USD ($) real_estate_brokerage_operations
Business Acquisition [Line Items]
Goodwill acquired	$ 11
Company Owned Brokerage Services
Business Acquisition [Line Items]
Goodwill acquired	11
Title and Settlement Services
Business Acquisition [Line Items]
Goodwill acquired	$ 0
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	2	13
Cash consideration paid for acquisition	$ 13	$ 96
Liabilities established related to contingent consideration		13
Goodwill acquired	11	94
Other assets acquired	1	7
Other Liabilities Acquired		3
NRT Business Combinations [Member] \| Amortizable—Pendings and listings (f) \| Company Owned Brokerage Services
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 1	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		3
Cash consideration paid for acquisition		$ 34
Liabilities established related to contingent consideration		37
Goodwill acquired		47
Other assets acquired		1
TRG Business Combinations [Member] \| Indefinite life—Trademarks (b) \| Title and Settlement Services
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired		9
TRG Business Combinations [Member] \| Indefinite life—Title plant shares (e) \| Title and Settlement Services
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired		1
TRG Business Combinations [Member] \| Amortizable—Pendings and listings (f) \| Title and Settlement Services
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		8
TRG Business Combinations [Member] \| Amortizable—Other (g) \| Title and Settlement Services
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 5

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Amount of increase in other liabilities (current and noncurrent), resulting from a business combination.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

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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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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-Paragraph 7
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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The number of businesses acquired by the entity during the period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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