| Cover | May 24, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 24, 2021 |
| Entity Registrant Name | PRICE T ROWE GROUP INC |
| Entity Central Index Key | 0001113169 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | MD |
| Entity File Number | 000-32191 |
| Entity Tax Identification Number | 52-2264646 |
| Entity Address, Address Line One | 100 East Pratt Street |
| Entity Address, City or Town | Baltimore |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 21202 |
| City Area Code | 410 |
| Local Phone Number | 345-2000 |
| 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 $0.20 |
| Trading Symbol | TROW |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
