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Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Investment [Line Items]    
Document Period End Date Dec. 31, 2021  
Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 25,041 $ 4,755
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (465) (75)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,159 758
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (104) (22)
Debt Securities, Available-for-sale, Unrealized Loss Position 27,200 5,513
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (569) (97)
U.S. Treasury and agency | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 363  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 70  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (3)  
Debt Securities, Available-for-sale, Unrealized Loss Position 433  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (6)  
Foreign | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 6,917 1,628
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (196) (35)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,093 114
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (62) (5)
Debt Securities, Available-for-sale, Unrealized Loss Position 8,010 1,742
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (258) (40)
Corporate securities | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 9,449 2,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (145) (33)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 806 593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (32) (14)
Debt Securities, Available-for-sale, Unrealized Loss Position 10,255 2,805
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (177) (47)
Mortgage-backed securities | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 8,086 875
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (116) (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 190 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7) (2)
Debt Securities, Available-for-sale, Unrealized Loss Position 8,276 910
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (123) (8)
States, municipalities, and political subdivisions | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 226 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (5) (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (1)
Debt Securities, Available-for-sale, Unrealized Loss Position 226 56
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (5) $ (2)