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Note 3. Acquisitions Acquisitions (Details) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2014 USD ($) Offices	Dec. 31, 2015 USD ($) real_estate_brokerage_operations	Dec. 31, 2014 USD ($) real_estate_brokerage_operations	Dec. 31, 2013 USD ($) real_estate_brokerage_operations
Business Acquisition [Line Items]
Contingent consideration period		4 years
Goodwill acquired		$ 141	$ 142	$ 31
Zip Realty [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition	$ 167
Goodwill acquired	92
Software and Fixed Assets Acquired	18
Deferred Tax Assets Acquired	46
Other Assets Acquired	6
Other Liabilities Acquired	$ 6
Number Of Offices Acquired | Offices	23
Title and Settlement Services
Business Acquisition [Line Items]
Goodwill acquired		$ 47	$ 5	0
Title and Settlement Services | TRG Business Combinations [Member]
Business Acquisition [Line Items]
Number of businesses acquired | real_estate_brokerage_operations		3	3
Cash consideration paid for acquisition		$ 34	$ 6
Liabilities established related to acquisition		37
Goodwill acquired		47	5
Other Assets Acquired		1
Company Owned Real Estate Brokerage Services
Business Acquisition [Line Items]
Goodwill acquired		$ 94	$ 86	$ 31
Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]
Business Acquisition [Line Items]
Number of businesses acquired | real_estate_brokerage_operations		13	16	15
Cash consideration paid for acquisition		$ 96	$ 44	$ 32
Liabilities established related to acquisition		13	19	4
Goodwill acquired		94	45	31
Other Assets Acquired		7	3
Other Liabilities Acquired		$ 3	1
Amortizable—Pendings and listings (f)
Business Acquisition [Line Items]
Useful Life of Pendings and Listings		5 months
Amortizable—Pendings and listings (f) | Zip Realty [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 3
Amortizable—Pendings and listings (f) | Title and Settlement Services | TRG Business Combinations [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		$ 8	1
Amortizable—Pendings and listings (f) | Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		10	4
Amortizable—Other (g) | Zip Realty [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	7
Amortizable—Other (g) | Title and Settlement Services | TRG Business Combinations [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		5
Amortizable—Other (g) | Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired		1	8
Amortizable—Customer relationships (d) | Zip Realty [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 1
Pendings and Listings and Other Intangibles [Member] [Member] | Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired				$ 5
Unamortizable—Trademarks (b) | Title and Settlement Services | TRG Business Combinations [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired		9
Unamortizable—Trademarks (b) | Company Owned Real Estate Brokerage Services | NRT Business Combinations [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired			$ 4
Unamortizable—Title plant shares (e) | Title and Settlement Services | TRG Business Combinations [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired		$ 1

X

- Definition

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+ References

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+ References

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Amount of increase in software and fixed assets, resulting from a business combination.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 30
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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