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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2018
Feb. 12, 2019
Jun. 29, 2018
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2018    
Entity Registrant Name PRICE T ROWE GROUP INC    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Public Float     $ 27.6
Entity Common Stock, Shares Outstanding (shares)   236,263,621  
Entity Central Index Key 0001113169    
Amendment Flag false