v3.5.0.2
Document and Entity Information
6 Months Ended
Jun. 30, 2016
shares
Document Document And Entity Information [Abstract]  
Entity Registrant Name PROGRESSIVE CORP/OH/
Entity Central Index Key 0000080661
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Document Type 10-Q
Document Period End Date Jun. 30, 2016
Document Fiscal Year Focus 2016
Document Fiscal Period Focus Q2
Amendment Flag false
Trading Symbol PGR
Entity Common Stock, Shares Outstanding 581,915,711