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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2022
Apr. 30, 2022
Cover [Abstract]    
Entity Incorporation, State or Country Code MO  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2022  
Amendment flag false  
Entity registrant name REINSURANCE GROUP OF AMERICA, INCORPORATED  
Entity central index key 0000898174  
Entity current reporting status Yes  
Entity Interactive Data Current Yes  
Current fiscal year end date --12-31  
Entity filer category Large Accelerated Filer  
Common Shares Outstanding   66,989,863
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q1  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Small Business false  
Entity Tax Identification Number 43-1627032  
Document Transition Report false  
Entity File Number 1-11848