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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Ceded Credit Risk [Line Items]    
Claims Recoverable From Retrocessionaires Past Due $ 8 $ 4
Funds withheld payable 4,889 5,017
Embedded Derivative, Fair Value of Embedded Derivative Asset 149 160
Reinsurance Recoverable for Paid Claims and Claims Adjustments 2,700  
Funds withheld payable $ 4,889 $ 5,017
AM Best, A- Rating [Member]    
Ceded Credit Risk [Line Items]    
Ceded Credit Risk, Disclosure “B++(Good)”