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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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