| Cover Page and DEI | Oct. 06, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 6, 2021 |
| Entity Registrant Name | Realogy Holdings Corp. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35674 |
| Entity Tax Identification Number | 20-8050955 |
| Entity Address, Address Line One | 175 Park Avenue |
| Entity Address, City or Town | Madison |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07940 |
| City Area Code | 973 |
| Local Phone Number | 407-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | RLGY |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001398987 |
| Realogy Group LLC [Member] | |
| Entity Information [Line Items] | |
| Entity Registrant Name | Realogy Group LLC |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 333-148153 |
| Entity Tax Identification Number | 20-4381990 |
| Entity Central Index Key | 0001355001 |
