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Summary of Significant Accounting Policies Investments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from investments in unconsolidated entities | $ 0 | $ 19,000,000 | $ 11,000,000
Equity Method Investments | 69,000,000 | 51,000,000 |
Income (Loss) from Equity Method Investments | (18,000,000) | 4,000,000 | (18,000,000)
Proceeds from Equity Method Investment, Distribution | 3,000,000 | 3,000,000 | 63
Payments to Acquire Equity Method Investments | $ 12,000,000 | 15,000,000 | 55,000,000
Amortization of Intangible Assets related to GRA Acquisition |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Income (Loss) from Equity Method Investments |  | 2,000,000 | 3,000,000
Realogy Brokerage Group | Gain from sale of PHHHL assets by Guaranteed Rate Affinity |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments |  |  | 35
Income (Loss) from Equity Method Investments |  |  | (6)
Realogy Brokerage Group | Exit Costs related to PHHHL |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Income (Loss) from Equity Method Investments |  |  | (7)
Realogy Title Group |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Income (Loss) from Equity Method Investments |  |  | (4)
Realogy Title Group | Amortization of Intangible Assets related to GRA Acquisition |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Income (Loss) from Equity Method Investments |  |  | (3)
PHH Home Loans |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 4990.00% |  |
Proceeds from investments in unconsolidated entities |  | 19 |
Equity Method Investments |  | 0 |
PHH Home Loans | Realogy Brokerage Group |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Income (Loss) from Equity Method Investments |  |  | 22,000,000
Guaranteed Rate Affinity |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Unowned Percentage | 5010.00% |  |
Equity Method Investment, Ownership Percentage | 4990.00% |  |
Equity Method Investments | $ 60,000,000 | 43,000,000 |
Payments to Acquire Equity Method Investments | $ 2,000,000 | $ 4,000,000 | $ 55,000,000

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