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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-09518    
Entity Registrant Name PROGRESSIVE CORP/OH/    
Entity Incorporation, State or Country Code OH    
Entity Tax Identification Number 34-0963169    
Entity Address, Address Line One 6300 Wilson Mills Road,    
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    
Title of 12(b) Security Common Shares, $1.00 Par Value    
Trading Symbol PGR    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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 Public Float     $ 46,188,157,681
Entity Common Stock, Shares Outstanding   585,253,659  
Entity Central Index Key 0000080661    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Amendment Flag false    
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s Proxy Statement for the Annual Meeting of Shareholders to be held on May 8, 2020, and the Annual Report to Shareholders of The Progressive Corporation and subsidiaries for the year ended December 31, 2019, included as Exhibit 13 to this Form 10-K, are incorporated by reference in Parts I, II, III, and IV hereof.