XML 20 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Feb. 08, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Entity File Number 000-32191    
Entity Incorporation, State or Country Code MD    
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    
Title of 12(b) Security Common stock, $.20 par value per share    
Trading Symbol TROW    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 27.8
Entity Common Stock, Shares Outstanding (shares)   227,946,081  
Documents Incorporated by Reference In Part III, the Definitive Proxy Statement for the 2021 Annual Meeting of Stockholders to be filed pursuant to Regulation 14A.    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020    
Entity Registrant Name PRICE T ROWE GROUP INC    
Entity Central Index Key 0001113169    
Amendment Flag false