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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, 2019
Dec. 31, 2018
Investment [Line Items]    
Document Period End Date Dec. 31, 2019  
Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 5,563 $ 34,952
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (81) (953)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,337 27,762
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (88) (817)
Debt Securities, Available-for-sale, Unrealized Loss Position 8,900 62,714
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (169) (1,770)
U.S. Treasury and agency | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 234 523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) (4)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 339 2,859
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (50)
Debt Securities, Available-for-sale, Unrealized Loss Position 573 3,382
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1) (54)
Foreign | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,846 6,764
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (34) (208)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 802 5,349
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (28) (159)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,648 12,113
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (62) (367)
Corporate securities | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 2,121 16,538
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (40) (599)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 988 4,873
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (40) (255)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,109 21,411
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (80) (854)
Mortgage-backed securities | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,174 6,103
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6) (98)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 932 6,913
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (8) (229)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,106 13,016
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (14) (327)
States, municipalities, and political subdivisions | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 188 5,024
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (44)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 276 7,768
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (12) (124)
Debt Securities, Available-for-sale, Unrealized Loss Position 464 12,792
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (12) $ (168)