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Restructuring Costs (Details) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 USD ($) ft² | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  | $ 20 | $ 17 | $ 18 | $ 12 | $ 20 | $ 11 | $ 9 | $ 12 | $ 67 | [1],[2] | $ 52 | [1],[2] | $ 58 | [1],[2]
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease impairment of Company's Headquarters, Percent |  | 44.00% |  |  |  |  |  |  |  | 44.00% |  |  |  |  |
Impaired or restructured lease | ft² |  | 1,000,000 |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Other Asset Impairment Charges |  | $ 16 | $ 11 | $ 19 | 4 | 6 | $ 3 | $ 2 | $ 1 | $ 50 |  | 12 |  |  |
Madison Headquarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired or restructured lease | ft² |  | 120,000 |  |  |  |  |  |  |  | 120,000 |  |  |  |  |
Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  | $ 15 |  | 14 |  | 14 |
Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  | 37 |  | 25 |  | 37 |
Realogy Title Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  | 4 |  | 3 |  | 4 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  | 11 |  | 10 |  | 3 |
Leadership Realignment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 |  |  |  |  | 5 |  |  |  |  | 5 |  |  |  |  |
Increase (Decrease) in Restructuring Reserve |  |  |  |  |  |  |  |  |  | (5) |  |  |  |  |
Balance at December 31, 2020 |  |  |  |  |  | 5 |  |  |  |  |  | 5 |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount remaining to be incurred (1) |  | $ 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |
Operational Efficiencies Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 |  |  |  |  | 14 |  |  |  |  | 14 |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  | 65 | [3] | 47 |  |  |
Increase (Decrease) in Restructuring Reserve |  |  |  |  |  |  |  |  |  | (52) |  |  |  |  |
Balance at December 31, 2020 |  | 27 |  |  |  | 14 |  |  |  | 27 |  | 14 |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be incurred (1) | [4] | 168 |  |  |  |  |  |  |  | 168 |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 112 |  |  |  |  |  |  |  | 112 |  |  |  |  |
Total amount remaining to be incurred (1) |  | 56 |  |  |  |  |  |  |  | 56 |  |  |  |  |
Operational Efficiencies Program | Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be incurred (1) |  | 31 |  |  |  |  |  |  |  | 31 |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 28 |  |  |  |  |  |  |  | 28 |  |  |  |  |
Total amount remaining to be incurred (1) |  | 3 |  |  |  |  |  |  |  | 3 |  |  |  |  |
Operational Efficiencies Program | Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be incurred (1) |  | 83 |  |  |  |  |  |  |  | 83 |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 60 |  |  |  |  |  |  |  | 60 |  |  |  |  |
Total amount remaining to be incurred (1) |  | 23 |  |  |  |  |  |  |  | 23 |  |  |  |  |
Operational Efficiencies Program | Realogy Title Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be incurred (1) |  | 6 |  |  |  |  |  |  |  | 6 |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 6 |  |  |  |  |  |  |  | 6 |  |  |  |  |
Total amount remaining to be incurred (1) |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |
Operational Efficiencies Program | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be incurred (1) |  | 48 |  |  |  |  |  |  |  | 48 |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 18 |  |  |  |  |  |  |  | 18 |  |  |  |  |
Total amount remaining to be incurred (1) |  | 30 |  |  |  |  |  |  |  | 30 |  |  |  |  |
Prior restructuring programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Personnel-related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net | [5] |  |  |  |  |  |  |  |  | 20 |  | 33 |  | 25 |
Personnel-related costs | Operational Efficiencies Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 |  |  |  |  | 9 |  |  |  |  | 9 |  |  |  |  |
Restructuring costs, net | [3] |  |  |  |  |  |  |  |  | 20 |  |  |  |  |
Increase (Decrease) in Restructuring Reserve |  |  |  |  |  |  |  |  |  | (24) |  |  |  |  |
Balance at December 31, 2020 |  | 5 |  |  |  | 9 |  |  |  | 5 |  | 9 |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be incurred (1) | [4] | 54 |  |  |  |  |  |  |  | 54 |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 50 |  |  |  |  |  |  |  | 50 |  |  |  |  |
Total amount remaining to be incurred (1) |  | 4 |  |  |  |  |  |  |  | 4 |  |  |  |  |
Facility-related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net | [6] |  |  |  |  |  |  |  |  | 47 |  | 18 |  | 22 |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 46 |  |  |  |  |
Facility-related costs | Leadership Realignment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Facility-related costs | Operational Efficiencies Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 |  |  |  |  | $ 5 |  |  |  |  | 5 |  |  |  |  |
Restructuring costs, net | [3] |  |  |  |  |  |  |  |  | 45 |  |  |  |  |
Increase (Decrease) in Restructuring Reserve |  |  |  |  |  |  |  |  |  | (28) |  |  |  |  |
Balance at December 31, 2020 |  | 22 |  |  |  | $ 5 |  |  |  | 22 |  | 5 |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be incurred (1) | [4] | 113 |  |  |  |  |  |  |  | 113 |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 61 |  |  |  |  |  |  |  | 61 |  |  |  |  |
Total amount remaining to be incurred (1) |  | 52 |  |  |  |  |  |  |  | 52 |  |  |  |  |
Internal Use Software Impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net | [7] |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 11 |
Other Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net | [8] |  |  |  |  |  |  |  |  | 0 |  | $ 1 |  | $ 0 |
Other Restructuring | Operational Efficiencies Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be incurred (1) | [4] | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |
Total amount remaining to be incurred (1) |  | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
[1] | Restructuring charges for the year ended December 31, 2020 include $65 million related to the Facility and Operational Efficiencies Program and $2 million related to the Leadership Realignment and Other Restructuring Activities Program. The year ended December 31, 2019 includes $47 million of expense related to the Facility and Operational Efficiencies Program and $5 million of expense primarily related to the Leadership Realignment and Other Restructuring Activities Program. The year ended December 31, 2018 includes costs primarily related to the Leadership Realignment and Other Restructuring Activities Program
[2] | The year ended December 31, 2020 includes restructuring charges of $15 million at Realogy Franchise Group, $37 million at Realogy Brokerage Group, $4 million at Realogy Title Group and $11 million at Corporate and Other. The year ended December 31, 2019 includes restructuring charges of $14 million at Realogy Franchise Group, $25 million at Realogy Brokerage Group, $3 million at Realogy Title Group and $10 million at Corporate and Other. The year ended December 31, 2018 includes restructuring charges of $14 million at Realogy Franchise Group, $37 million at Realogy Brokerage Group, $4 million at Realogy Title Group and $3 million at Corporate and Other.
[3] | In addition, the Company incurred an additional $46 million of facility-related costs for lease asset impairments in connection with the Facility and Operational Efficiencies Program during the year ended December 31, 2020.
[4] | Facility-related costs include potential lease asset impairments to be incurred under the Facility and Operational Efficiencies Program
[5] | Personnel-related costs consist of severance costs provided to employees who have been terminated and duplicate payroll costs during transition.
[6] | Facility-related costs consist of costs associated with planned facility closures such as contract termination costs, amortization of lease assets that will continue to be incurred under the contract for its remaining term without economic benefit to the Company, accelerated depreciation on asset disposals and other facility and employee relocation related costs.
[7] | Internal use software impairment relates to development costs capitalized for a project that was determined to not meet the Company's strategic goals when analyzed by the Company's leadership team.
[8] | Other restructuring costs consist of costs related to professional fees, consulting fees and other costs associated with restructuring activities which are primarily included in the Corporate and Other business segment.

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