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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 [Member] - USD ($)
$ in Millions
Sep. 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 $ 63,672 $ 25,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6,132) (465)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 10,149 2,159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,819) (104)
Debt Securities, Available-for-sale, Unrealized Loss Position 73,821 27,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (7,951) (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 1,873 363
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (145) (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 227 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (29) (3)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,100 433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (174) (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 16,585 6,917
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,480) (196)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,907 1,093
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (588) (62)
Debt Securities, Available-for-sale, Unrealized Loss Position 20,492 8,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,068) (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 28,533 9,449
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,832) (145)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,621 806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (456) (32)
Debt Securities, Available-for-sale, Unrealized Loss Position 31,154 10,255
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (3,288) (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 12,776 8,086
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,459) (116)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,324 190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (728) (7)
Debt Securities, Available-for-sale, Unrealized Loss Position 16,100 8,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,187) (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 3,905 226
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (216) (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 70 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (18) 0
Debt Securities, Available-for-sale, Unrealized Loss Position 3,975 226
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (234) $ (5)