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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, 2017 USD ($) | Dec. 31, 2017 USD ($) Brokerage_Offices | Dec. 31, 2017 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2016 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2015 USD ($) franchisedandcompanyownedoffices
Franchised: |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 13,314 | 12,771 | 12,769
Additions |  |  | 1,137 | 847 | 445
Terminations/Closures |  |  | (412) | (304) | (443)
Ending balance |  |  | 14,039 | 13,314 | 12,771
Company Owned: |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 789 | 787 | 727
Additions |  |  | 20 | 38 | 74
Terminations/Closures |  |  | (20) | (36) | (14)
Ending balance |  | 790 | 789 | 789 | 787
Franchisee Conversion Notes and Development Advance Notes |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Franchise conversion and development advance notes | $ | $ 124 | $ 124 | $ 124 | $ 123 |
Allowance for franchise conversion and development advance notes | $ | 1 | $ 1 | $ 1 | 1 |
Forgiveness of franchise conversion and development advance notes | $ | $ 25 |  |  | $ 24 | $ 22

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