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v3.20.4

Franchising and Marketing Activities Change in the Number of Franchised and Brokerage Outlets (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2020 USD ($) Brokerage_Offices | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2018 USD ($) franchisedandcompanyownedoffices
Franchised (domestic and international): |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance | 17,776 |  |  | 15,830 | 14,039
Additions | 2,109 |  |  | 2,399 | 2,149
Terminations/Closures | (499) |  |  | (453) | (358)
Ending balance | 19,386 |  |  | 17,776 | 15,830
Company owned: |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance | 713 |  |  | 755 | 789
Additions | 5 |  |  | 4 | 8
Terminations/Closures | (45) |  |  | (46) | (42)
Ending balance | 673 | 670 |  | 713 | 755
Franchisee Conversion Notes and Development Advance Notes |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Franchise conversion and development advance notes | $ | $ 155 | $ 155 | $ 155 | $ 134 |
Forgiveness of franchise conversion and development advance notes | $ |  |  | $ 32 | $ 29 | $ 29

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- Definition Amount, after allowance for credit loss, of financing receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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