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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Credit Loss [Abstract]    
Balance at beginning of period $ 6,564 $ 5,881
Balance at end of period 6,612 5,941
Allowance for Expected Credit Losses    
Balance at beginning of period 22 13
Change for provision of expected credit losses (1) 5
Balance at end of period $ 21 $ 18