v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Jul. 02, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-09518  
Entity Incorporation, State or Country Code OH  
Entity Tax Identification Number 34-0963169  
Entity Address, Address Line One 300 North Commons Blvd.,  
Entity Address, City or Town Mayfield Village,  
Entity Address, State or Province OH  
Entity Address, Postal Zip Code 44143  
City Area Code 440  
Local Phone Number 461-5000  
Entity Information, Former Legal or Registered Name Not Applicable  
Title of 12(b) Security Common Shares, $1.00 Par Value  
Trading Symbol PGR  
Security Exchange Name NYSE  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   581,371,770
Entity Registrant Name PROGRESSIVE CORP/OH/  
Entity Central Index Key 0000080661  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false