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Note 5. Franchising and Marketing Activities Franchising and Marketing Activities (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2017 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2016 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2018 Brokerage_Offices | Dec. 31, 2015 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items] |  |  |  |  |
Initial franchise and area development fees | $ | $ 6 | $ 8 | $ 8 |  |
Annual volume incentives from Real Estate Franchisees | $ | 52 | 62 | 56 |  |
Brand Marketing Fund Revenue | $ | $ 86 | $ 87 | $ 83 |  |
Franchised: |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 15,830 | 14,039 | 13,314 |  | 12,771
Franchised: | Century 21® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 9,637 | 7,973 | 7,330 |  |
Franchised: | ERA® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 2,331 | 2,298 | 2,347 |  |
Franchised: | Coldwell Banker® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 2,380 | 2,330 | 2,289 |  |
Franchised: | Coldwell Banker Commercial® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 171 | 180 | 180 |  |
Franchised: | Sotheby’s International Realty® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 949 | 905 | 836 |  |
Franchised: | Better Homes and Gardens® Real Estate |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 362 | 353 | 332 |  |
Company Owned: |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Royalty expense | $ | $ 295 | $ 299 | $ 282 |  |
Marketing and Advertising Expense | $ | $ 11 | $ 12 | $ 11 |  |
Number of offices | 755 | 789 | 789 | 760 | 787
Company Owned: | Coldwell Banker® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 672 | 707 | 708 |  |
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 | 42 | 41 | 40 |  |

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