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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2017
Feb. 14, 2018
Jun. 30, 2017
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 31, 2017    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017    
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 Public Float     $ 17.4
Entity Common Stock, Shares Outstanding (shares)   244,444,519  
Entity Central Index Key 0001113169    
Amendment Flag false