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Note 5. Franchising and Marketing Activities Franchising and Marketing Activities (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) Brokerage_Offices | Dec. 31, 2016 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2015 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2017 franchisedandcompanyownedoffices | Dec. 31, 2014 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items] |  |  |  |  |
Initial franchise and area development fees | $ | $ 8 | $ 8 | $ 8 |  |
Annual volume incentives from Real Estate Franchisees | $ | 62 | 56 | 51 |  |
Brand Marketing Fund Revenue | $ | 87 | $ 83 | $ 83 |  |
Franchised: |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 13,314 | 12,771 | 14,039 | 12,769
Franchised: | Century 21® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 7,330 | 6,897 | 7,973 |
Franchised: | ERA® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 2,347 | 2,355 | 2,298 |
Franchised: | Coldwell Banker® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 2,289 | 2,258 | 2,330 |
Franchised: | Coldwell Banker Commercial® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 180 | 163 | 180 |
Franchised: | Sotheby’s International Realty® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 836 | 794 | 905 |
Franchised: | Better Homes and Gardens® Real Estate |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 332 | 304 | 353 |
Company Owned: |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Royalty expense | $ | 299 | $ 282 | $ 284 |  |
Marketing and Advertising Expense | $ | $ 12 | $ 11 | $ 11 |  |
Number of offices | 790 | 789 | 787 | 789 | 727
Company Owned: | Coldwell Banker® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 708 | 708 | 707 |
Company Owned: | Sotheby’s International Realty® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 41 | 41 | 41 |
Company Owned: | Corcoran Other |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices |  | 40 | 38 | 41 |

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