| Cover Page and DEI | Oct. 28, 2021 | Jul. 29, 2021 |
| Entity Information [Line Items] | ||
| Document Type | 8-K | |
| Document Period End Date | Oct. 28, 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 |
