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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Credit Loss [Abstract]    
Balance at beginning of period $ 7,064 $ 6,564
Balance at end of period 7,509 6,612
Allowance for Expected Credit Losses    
Balance at beginning of period 21 22
Change for provision of expected credit losses (5) (1)
Balance at end of period $ 16 $ 21