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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost $ 113,529   $ 111,128      
Debt Securities, Available-for-sale, Allowance for Credit Loss (122) $ (115) (156) $ (193) $ (168) $ (169)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 823   1,148      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax (6,390)   (5,549)      
Available for sale, Fair Value 107,840   106,571      
U.S. Treasury / Agency            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost 2,906   3,721      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3   13      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax (168)   (144)      
Available for sale, Fair Value 2,741   3,590      
Non-U.S.            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost 35,933   35,918      
Debt Securities, Available-for-sale, Allowance for Credit Loss (45)   (49)      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 482   592      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax (1,452)   (1,297)      
Available for sale, Fair Value 34,918   35,164      
Corporate and asset-backed securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost 45,952   44,695      
Debt Securities, Available-for-sale, Allowance for Credit Loss (76)   (104)      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 255   390      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax (2,511)   (2,151)      
Available for sale, Fair Value 43,620   42,830      
Mortgage-backed securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost 26,632   23,720      
Debt Securities, Available-for-sale, Allowance for Credit Loss (1)   (3)      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 75   143      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax (2,092)   (1,802)      
Available for sale, Fair Value 24,614   22,058      
Municipal            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost 2,106   3,074      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8   10      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax (167)   (155)      
Available for sale, Fair Value $ 1,947   $ 2,929