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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Credit Loss [Abstract]    
Balance at beginning of period $ 8,260 $ 7,064
Balance at end of period 8,969 7,509
Allowance for Expected Credit Losses    
Balance at beginning of period 17 21
Change for provision of expected credit losses 0 (5)
Balance at end of period $ 17 $ 16