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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, 2021 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2021 USD ($) Brokerage_Offices | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2019 USD ($) franchisedandcompanyownedoffices
Franchised (domestic and international): |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance | 19,386 |  |  | 17,776 | 15,830
Additions | 1,583 |  |  | 2,109 | 2,399
Terminations/Closures | (614) |  |  | (499) | (453)
Ending balance | 20,355 |  |  | 19,386 | 17,776
Company owned: |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance | 673 |  |  | 713 | 755
Additions | 25 |  |  | 5 | 4
Terminations/Closures | (23) |  |  | (45) | (46)
Ending balance | 675 | 680 |  | 673 | 713
Franchisee Conversion Notes and Development Advance Notes |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Franchise conversion and development advance notes | $ | $ 164 | $ 164 | $ 164 | $ 155 |
Forgiveness of franchise conversion and development advance notes | $ |  |  | $ 32 | $ 32 | $ 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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