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Acquisitions Investments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Oct. 07, 2021
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Asia Pacific        
Investment Holdings [Line Items]        
BusinessAcquisitionCostOfAcquiredEntityExpectedCashConsideration [Member]       $ 5,720
Huatai Group [Member] | CHINA        
Investment Holdings [Line Items]        
Equity method investment, additional 31.8 percent agreed on   31.80%    
Purchase of incremental ownership interest   $ 2,200    
Deposits Assets   $ 1,100    
Payment to acquire additional ownership interest in equity method investment $ 113   $ 500  
Equity method investment, additional 7.1 percentage agreed on   7.10%    
Huatai Group [Member] | CHINA | Direct ownership        
Investment Holdings [Line Items]        
Equity Method Investment, Ownership Percentage 47.30%