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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Credit Loss [Abstract]    
Balance at beginning of period $ 7,064 $ 6,564
Balance at end of period 8,260 7,064
Allowance for Expected Credit Losses    
Balance at beginning of period 21 22
Change for provision of expected credit losses (4) (1)
Balance at end of period $ 17 $ 21