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Note 3. Acquisitions Acquisitions (Details) £ in Millions, $ in Millions	12 Months Ended
	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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
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-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

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