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Investments, Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost $ 39,826   $ 38,963      
Gross unrealized gains 5,199   5,800      
Gross unrealized losses 70   77      
Allowance for credit loss 45 $ 43 40 $ 51 $ 49 $ 0
Estimated fair value 44,910   44,646      
Shadow adjustments 2,400   2,500      
Fixed Maturities Available-for-Sale [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 39,816   38,926      
Gross unrealized gains 5,199   5,795      
Gross unrealized losses 70   77      
Allowance for credit loss 45   40      
Estimated fair value 44,900   44,604      
Corporate and Other Bonds [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 21,291   20,792      
Gross unrealized gains 3,153   3,578      
Gross unrealized losses 35   22      
Allowance for credit loss 24 27 23 39 49 0
Estimated fair value 24,385   24,325      
States, Municipalities and Political Subdivisions [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 10,125   9,729      
Gross unrealized gains 1,743   1,863      
Gross unrealized losses 2          
Estimated fair value 11,866   11,592      
Asset-Backed [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 7,743   7,554      
Gross unrealized gains 281   320      
Gross unrealized losses 27   52      
Allowance for credit loss 21 $ 16 17 $ 12 $ 0 $ 0
Estimated fair value 7,976   7,805      
Residential Mortgage-Backed [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 3,337   3,442      
Gross unrealized gains 99   146      
Gross unrealized losses 10   1      
Estimated fair value 3,426   3,587      
Commercial Mortgage-Backed [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 2,068   1,933      
Gross unrealized gains 98   93      
Gross unrealized losses 14   42      
Allowance for credit loss 17   17      
Estimated fair value 2,135   1,967      
Other Asset-Backed [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 2,338   2,179      
Gross unrealized gains 84   81      
Gross unrealized losses 3   9      
Allowance for credit loss 4          
Estimated fair value 2,415   2,251      
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 142   339      
Gross unrealized gains     2      
Gross unrealized losses 5   3      
Estimated fair value 137   338      
Foreign Government [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 515   512      
Gross unrealized gains 22   32      
Gross unrealized losses 1          
Estimated fair value 536   544      
Fixed Maturities Trading [Member]            
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]            
Cost or amortized cost 10   37      
Gross unrealized gains     5      
Estimated fair value $ 10   $ 42