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Note 5. Franchising and Marketing Activities Change in the Number of Franchised and Company Owned Outlets (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2016 USD ($) Brokerage_Offices | Dec. 31, 2015 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2014 USD ($) franchisedandcompanyownedoffices
Franchised: |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance |  | 12,771 |  | 12,769 | 13,032
Additions |  | 847 |  | 445 | 311
Terminations/Closures |  | (304) |  | (443) | (574)
Ending balance |  | 13,314 |  | 12,771 | 12,769
Company Owned: |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance |  | 787 |  | 727 | 706
Additions |  | 38 |  | 74 | 38
Terminations/Closures |  | (36) |  | (14) | (17)
Ending balance |  | 789 | 790 | 787 | 727
Franchisee Conversion Notes and Development Advance Notes [Member] |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Franchise conversion and development advance notes | $ | $ 123 | $ 123 | $ 123 | $ 115 |
Allowance for franchise conversion and development advance notes | $ | 1 | $ 1 | $ 1 | 1 |
Forgiveness of franchise conversion and development advance notes | $ | $ 19 |  |  | $ 17 | $ 15

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