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Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Gain (Loss) on Securities [Line Items]      
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) $ (118) $ (214)  
Foreign exchange gains( losses) (223) (183) $ 397
Derivative, Gain (Loss) on Derivative, Net (358) (252) 133
Net realized gains (losses) 117 (607) (1,085)
Unrealized Gain (Loss) on Investments (361) 3,120 (9,535)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax (110) (328) 1,043
Other derivative instruments      
Gain (Loss) on Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (4) (10) (11)
Investment and embedded derivative instruments      
Gain (Loss) on Securities [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (189) (53) (43)
Fixed Maturities [Member]      
Gain (Loss) on Securities [Line Items]      
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment 132 208 619
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment (535) (656) (1,379)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) 86 43 (154)
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [1] (94) (64) (135)
Debt Securities, Available-for-sale, Realized Gain (Loss) 191 (481) (1,049)
Equity Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Equity Securities, FV-NI, Realized Gain (Loss) [2] 194 (38) (230)
Unrealized Gain (Loss) on Investments 169 30 (639)
Other Investments      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) [2] 602 (12) 0
Unrealized Gain (Loss) on Investments 598 (12)  
Available-for-sale Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Unrealized Gain (Loss) on Investments (251) 3,563 (10,583)
Fixed maturities held to maturity      
Gain (Loss) on Securities [Line Items]      
Unrealized Gain (Loss) on Investments 0 (125) (15)
Other [Member]      
Gain (Loss) on Securities [Line Items]      
Gain (Loss) on Sale of Other Investments 24 88 (118)
Unrealized Gain (Loss) on Investments 0 10 20
Private equities      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) 124 70 (31)
Unrealized Gain (Loss) on Investments 124 $ 70 $ (31)
Reserved alternative investment fund      
Gain (Loss) on Securities [Line Items]      
Equity Securities, FV-NI, Realized Gain (Loss) 22    
Other Investments - Fixed Maturities [Member]      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) $ 275    
[1] Relates to certain securities we intended to sell and securities written to market entering default.
[2] In 2024, Other investments - Fixed maturities and Equity securities includes $275 million and $(22) million, respectively, of realized gains (losses) related to investments measured under the fair value option.