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Cover Page - USD ($)
12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 56,938,339,392
Entity Common Stock, Shares Outstanding   584,848,536  
Entity Central Index Key 0000080661    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
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 13, 2022, and the Annual Report to Shareholders of The Progressive Corporation and subsidiaries for the year ended December 31, 2021, included as Exhibit 13 to this Form 10-K, are incorporated by reference in Parts I, II, III, and IV hereof.