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Investments, Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost $ 39,293 $ 38,963    
Gross unrealized gains 4,516 5,800    
Gross unrealized losses 182 77    
Allowance for credit loss 43 40 $ 49 $ 0
Estimated fair value 43,584 44,646    
Shadow adjustments 2,100 2,500    
Fixed Maturities Available-for-Sale [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 39,257 38,926    
Gross unrealized gains 4,513 5,795    
Gross unrealized losses 182 77    
Allowance for credit loss 43 40    
Estimated fair value 43,545 44,604    
Corporate and Other Bonds [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 21,110 20,792    
Gross unrealized gains 2,644 3,578    
Gross unrealized losses 71 22    
Allowance for credit loss 27 23 49 0
Estimated fair value 23,656 24,325    
States, Municipalities and Political Subdivisions [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 10,041 9,729    
Gross unrealized gains 1,590 1,863    
Gross unrealized losses 31      
Estimated fair value 11,600 11,592    
Asset-Backed [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 7,448 7,554    
Gross unrealized gains 255 320    
Gross unrealized losses 71 52    
Allowance for credit loss 16 17 $ 0 $ 0
Estimated fair value 7,616 7,805    
Residential Mortgage-Backed [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 3,215 3,442    
Gross unrealized gains 108 146    
Gross unrealized losses 40 1    
Estimated fair value 3,283 3,587    
Commercial Mortgage-Backed [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 1,952 1,933    
Gross unrealized gains 76 93    
Gross unrealized losses 24 42    
Allowance for credit loss 16 17    
Estimated fair value 1,988 1,967    
Other Asset-Backed [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 2,281 2,179    
Gross unrealized gains 71 81    
Gross unrealized losses 7 9    
Estimated fair value 2,345 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 138 339    
Gross unrealized gains 1 2    
Gross unrealized losses 7 3    
Estimated fair value 132 338    
Foreign Government [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 508 512    
Gross unrealized gains 23 32    
Gross unrealized losses 2      
Estimated fair value 529 544    
Redeemable Preferred Stock [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 12      
Estimated fair value 12      
Fixed Maturities Trading [Member]        
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]        
Cost or amortized cost 36 37    
Gross unrealized gains 3 5    
Estimated fair value $ 39 $ 42