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Acquisitions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) real_estate_brokerage_operations | Dec. 31, 2016 USD ($) real_estate_brokerage_operations
Business Acquisition [Line Items] |  |
Goodwill acquired | $ 1 |
Company Owned Brokerage Services |  |
Business Acquisition [Line Items] |  |
Goodwill acquired | 1 |
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 | 5 | 11
Cash consideration paid for acquisition | $ 1 | $ 74
Goodwill acquired | $ 1 | 52
Liabilities established related to contingent consideration |  | 9
Other assets acquired |  | 5
Other liabilities acquired |  | 3
NRT Business Combinations [Member] | Customer relationships | Company Owned Brokerage Services |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets acquired |  | 20
NRT Business Combinations [Member] | Pendings and listings | Company Owned Brokerage Services |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets acquired |  | 6
NRT Business Combinations [Member] | Other intangible assets | Company Owned Brokerage Services |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets acquired |  | $ 3
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
Cash consideration paid for acquisition |  | $ 24
Goodwill acquired |  | 20
Liabilities established related to contingent consideration |  | 10
Other assets acquired |  | 6
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
TRG Business Combinations [Member] | Indefinite life—Title plant shares (e) | Title and Settlement Services |  |
Business Acquisition [Line Items] |  |
Indefinite-lived intangible assets acquired |  | 7
TRG Business Combinations [Member] | Pendings and listings | Title and Settlement Services |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets acquired |  | 5
TRG Business Combinations [Member] | Other intangible assets | Title and Settlement Services |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets acquired |  | $ 2

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