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Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Details) - Fixed maturities - USD ($)
$ in Millions
Dec. 31, 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 $ 57,189 $ 25,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (4,115) (465)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 14,991 2,159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,291) (104)
Debt Securities, Available-for-sale, Unrealized Loss Position 72,180 27,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (6,406) (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 2,152 363
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (125) (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 386 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (46) (3)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,538 433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (171) (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 15,538 6,917
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,012) (196)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 5,490 1,093
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (704) (62)
Debt Securities, Available-for-sale, Unrealized Loss Position 21,028 8,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,716) (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 25,687 9,449
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,793) (145)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 4,190 806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (552) (32)
Debt Securities, Available-for-sale, Unrealized Loss Position 29,877 10,255
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,345) (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 10,561 8,086
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,033) (116)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 4,770 190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (941) (7)
Debt Securities, Available-for-sale, Unrealized Loss Position 15,331 8,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,974) (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 3,251 226
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (152) (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 155 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (48) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 3,406 226
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (200) $ (5)