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Investments - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]        
Variable Interest Entity, Primary Beneficiary, Maximum Loss Exposure, Amount   $ 0 $ 0  
Proceeds from Sale of Debt Securities, Available-for-sale   22,457 19,534 $ 18,499
Maximum exposure to loss for variable interest   $ 1,900 1,300  
Required collateral under securities lending   100.00%    
Securities Loaned   $ 0 0  
Securities for Reverse Repurchase Agreements   30 30  
Income (Loss) from Equity Method Investments   630 244 267
Equity method investments   2,900    
Commitments to fund limited partnership and alternative investments   $ 1,600    
Aggregate investment income from limited partnerships and other alternative investments   10.00%    
Total assets   $ 76,578 74,111  
Total liabilities   58,735 55,555  
Total net investment income   2,313 1,846 1,951
Life and Annuity Insurance Product Line, Run-off Business        
Schedule of Investments [Line Items]        
Proceeds from Sale of Equity Method Investments $ 217      
Equity Method Investment, Realized Gain (Loss) on Disposal $ 46 46    
Limited Partner [Member]        
Schedule of Investments [Line Items]        
Total net investment income   2,100 954 618
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Limited Partner [Member]        
Schedule of Investments [Line Items]        
Total assets   249,800 339,600  
Total liabilities   41,000 181,500  
Total net investment income   $ 46,700 7,400 13,400
Maximum        
Schedule of Investments [Line Items]        
Term of security lending agreement   90 days    
Variable Interest Entity, Not Primary Beneficiary [Member]        
Schedule of Investments [Line Items]        
Commitments for variable interest   $ 1,400 768  
US Treasury Securities [Member]        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Restricted   9 34  
Fixed maturities        
Schedule of Investments [Line Items]        
Proceeds from Sale of Debt Securities, Available-for-sale   $ 15,900 $ 15,100 $ 14,400
Domestic [Member]        
Schedule of Investments [Line Items]        
Collateral provided by borrowers under securities lending   102.00%    
Non-domestic [Member]        
Schedule of Investments [Line Items]        
Collateral provided by borrowers under securities lending   105.00%