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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) - Fixed Maturities [Member] - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 62,944 $ 25,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (5,004) (465)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 5,372 2,159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (737) (104)
Debt Securities, Available-for-sale, Unrealized Loss Position 68,316 27,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (5,741) (569)
U.S. Treasury / Agency    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,707 363
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (70) (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 95 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (10) (3)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,802 433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (80) (6)
Non-U.S.    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 15,832 6,917
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,331) (196)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,578 1,093
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (334) (62)
Debt Securities, Available-for-sale, Unrealized Loss Position 18,410 8,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,665) (258)
Corporate and asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 27,714 9,449
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,346) (145)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,395 806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (204) (32)
Debt Securities, Available-for-sale, Unrealized Loss Position 29,109 10,255
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,550) (177)
Mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 15,048 8,086
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,140) (116)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,294 190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (187) (7)
Debt Securities, Available-for-sale, Unrealized Loss Position 16,342 8,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,327) (123)
Municipal    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 2,643 226
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (117) (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 10 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 2,653 226
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (119) $ (5)