| Cover | Sep. 21, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 21, 2021 |
| Entity File Number | 001-39432 |
| Entity Registrant Name | Rocket Companies, Inc. |
| Entity Central Index Key | 0001805284 |
| Entity Tax Identification Number | 84-4946470 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1050 Woodward Avenue |
| Entity Address, City or Town | Detroit |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48226 |
| City Area Code | 313 |
| Local Phone Number | 373-7990 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, par value $0.00001 per share |
| Trading Symbol | RKT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
