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Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity Fixed Maturities) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-maturity $ 9,009   $ 10,153      
Debt Securities, Held-to-maturity, Allowance for Credit Loss (33) $ (34) (35) $ (35) $ (37) $ (44)
Debt securities, held to maturity, net carrying value 8,976   10,118      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1   533      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (486)   (4)      
Held to maturity, at Fair Value 8,491   10,647      
U.S. Treasury / Agency            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-maturity 1,281   1,213      
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0   0      
Debt securities, held to maturity, net carrying value 1,281   1,213      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   34      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (52)   (3)      
Held to maturity, at Fair Value 1,229   1,244      
Non-U.S.            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-maturity 1,046   1,201      
Debt Securities, Held-to-maturity, Allowance for Credit Loss (4)   (5)      
Debt securities, held to maturity, net carrying value 1,042   1,196      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   66      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (86)   0      
Held to maturity, at Fair Value 956   1,262      
Corporate and asset-backed securities            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-maturity 1,769   2,032      
Debt Securities, Held-to-maturity, Allowance for Credit Loss (27)   (28)      
Debt securities, held to maturity, net carrying value 1,742   2,004      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   197      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (157)   0      
Held to maturity, at Fair Value 1,585   2,201      
Mortgage-backed securities            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-maturity 1,549   1,731      
Debt Securities, Held-to-maturity, Allowance for Credit Loss (1)   (1)      
Debt securities, held to maturity, net carrying value 1,548   1,730      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   74      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (110)   (1)      
Held to maturity, at Fair Value 1,438   1,803      
Municipal            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-maturity 3,364   3,976      
Debt Securities, Held-to-maturity, Allowance for Credit Loss (1)   (1)      
Debt securities, held to maturity, net carrying value 3,363   3,975      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1   162      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (81)   0      
Held to maturity, at Fair Value $ 3,283   $ 4,137