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Acquisitions Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2019
Oct. 07, 2021
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Subsequent Event [Member]        
Investment Holdings [Line Items]        
BusinessAcquisitionCostOfAcquiredEntityExpectedCashConsideration [Member]       $ 5,750
Huatai Group [Member] | CHINA        
Investment Holdings [Line Items]        
Equity Method Investment, Ownership Percentage 47.10% 47.10%    
Equity method investment, additional 7.1 percentage agreed on     7.10%  
Equity method investment, additional 6.4 percentage agreed on [Table] 6.40%      
Equity method investment, incremental 0.9 percent obtained   0.90%    
Purchase of incremental ownership interest   $ 65    
Deposits Assets $ 143 $ 143