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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Credit Loss [Abstract]    
Balance at beginning of period $ 8,260 $ 7,064
Balance at end of period 9,526 8,260
Allowance for Expected Credit Losses    
Balance at beginning of period 17 21
Change for provision of expected credit losses 0 (4)
Balance at end of period $ 17 $ 17