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Acquisitions (Details) £ in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 GBP (£) real_estate_brokerage_operations | Jun. 30, 2017 USD ($) real_estate_brokerage_operations | Dec. 31, 2016 USD ($) real_estate_brokerage_operations
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  | $ 4 |
Company Owned Brokerage Services |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  | 4 |
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 | 7 | 7 | 11
Cash consideration paid for acquisition | £ 4 |  | $ 74
Goodwill acquired |  | $ 3 | 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 |  | $ 1 | $ 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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