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Document and Entity Information - shares
9 Months Ended
Sep. 30, 2018
Oct. 23, 2018
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Period End Date Sep. 30, 2018  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2018  
Entity Registrant Name PRICE T ROWE GROUP INC  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding (shares)   240,654,698
Entity Central Index Key 0001113169  
Amendment Flag false  
Entity Emerging Growth Company false  
Entity Small Business false