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Franchising and Marketing Activities (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2020 USD ($) franchisedandcompanyownedoffices Countries | Dec. 31, 2019 USD ($) franchisedandcompanyownedoffices Countries | Dec. 31, 2021 Brokerage_Offices | Dec. 31, 2018 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items] |  |  |  |  |
Initial franchise and area development fees | $ | $ 5 | $ 7 | $ 9 |  |
Annual volume incentives from Real Estate Franchisees | $ | 87 | 63 | 50 |  |
Brand Marketing Fund Revenue | $ | $ 92 | $ 69 | $ 90 |  |
Franchised (domestic and international): |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 20,355 | 19,386 | 17,776 |  | 15,830
Franchised (domestic and international): | Century 21® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 14,246 | 13,222 | 11,640 |  |
Franchised (domestic and international): | ERA® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 2,355 | 2,318 | 2,301 |  |
Franchised (domestic and international): | Coldwell Banker® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 2,071 | 2,263 | 2,323 |  |
Franchised (domestic and international): | Coldwell Banker Commercial® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 164 | 168 | 159 |  |
Franchised (domestic and international): | Sotheby’s International Realty® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 986 | 952 | 962 |  |
Franchised (domestic and international): | Better Homes and Gardens® Real Estate |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 411 | 389 | 391 |  |
Franchised (domestic and international): | Corcoran® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 122 | 74 | 0 |  |
Company owned: |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Royalty expense | $ | $ (393) | $ (306) | $ (282) |  |
Marketing and Advertising Expense | $ | $ (14) | $ (10) | $ (11) |  |
Number of offices | 675 | 673 | 713 | 680 | 755
Company owned: | Coldwell Banker® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 605 | 605 | 634 |  |
Company owned: | Sotheby’s International Realty® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 41 | 39 | 37 |  |
Company owned: | Corcoran® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 29 | 29 | 42 |  |

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