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Note 3. Acquisitions Acquisitions (Details) £ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 GBP (£) real_estate_brokerage_operations | Dec. 31, 2017 USD ($) real_estate_brokerage_operations | Dec. 31, 2016 USD ($) real_estate_brokerage_operations | Dec. 31, 2015 USD ($) real_estate_brokerage_operations
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  | $ 20 | $ 72 | $ 141
Title and Settlement Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of businesses acquired | real_estate_brokerage_operations | 2 | 2 | 1 | 3
Cash consideration paid for acquisition |  | $ 8 | $ 24 | $ 34
Liabilities established related to acquisition |  | 4 | 10 | 37
Goodwill acquired |  | $ 9 | 20 | 47
Other Assets Acquired |  |  | 6 | $ 1
Other Liabilities Acquired |  |  | $ 9 |
Company Owned Real Estate Brokerage Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of businesses acquired | real_estate_brokerage_operations | 16 | 16 | 11 | 13
Cash consideration paid for acquisition | £ 11 |  | $ 74 | $ 96
Liabilities established related to acquisition |  | $ 3 | 9 | 13
Goodwill acquired |  | $ 10 | 52 | 94
Other Assets Acquired |  |  | 5 | 7
Other Liabilities Acquired |  |  | 3 | 3
Amortizable—Pendings and listings (f) |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful Life of Pendings and Listings | 5 months | 5 months |  |
Amortizable—Pendings and listings (f) | Title and Settlement Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | 8
Amortizable—Pendings and listings (f) | Company Owned Real Estate Brokerage Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 2 | 6 | 10
Amortizable—Other (g) | Title and Settlement Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 1 | 2 | 5
Amortizable—Other (g) | Company Owned Real Estate Brokerage Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 1 | 3 | 1
Pendings | Title and Settlement Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 2 | 5 |
Amortizable—Customer relationships (d) | Company Owned Real Estate Brokerage Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 1 | 20 |
Indefinite life—Trademarks (b) | Title and Settlement Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  | 3 | 9
Indefinite life—Title plant shares (e) | Title and Settlement Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  | $ 7 | $ 1

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