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Acquisitions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) real_estate_brokerage_operations | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Acquisitions [Line Items] |  |  |  |
Goodwill acquired | $ 26 | [1] | $ 1 | $ 1
Realogy Brokerage Group |  |  |  |
Acquisitions [Line Items] |  |  |  |
Number of Businesses Acquired | real_estate_brokerage_operations | 3 |  |  |
Asset Acquisition, Consideration Transferred | $ 26 |  |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration |  |  | 6 |
Goodwill acquired | 24 | [1] | $ 0 | $ 0
Asset Acquisition, Consideration Transferred, Other Assets | 12 |  |  |
Asset Acquisition, Consideration Transferred, Other Liabilities | 10 |  |  |
Realogy Brokerage Group | Amortizable—Other |  |  |  |
Acquisitions [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 4 |  |  |
Realogy Brokerage Group | Indefinite life—Trademarks |  |  |  |
Acquisitions [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired | $ 2 |  |  |
[1] | Goodwill acquired during the year ended December 31, 2021 relates to the acquisition of three real estate brokerage operations and one title and settlement operations.

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