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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Credit Loss [Abstract]        
Balance at beginning of period $ 6,612 $ 5,941 $ 6,564 $ 5,881
Balance at end of period 6,717 5,939 6,717 5,939
Allowance for Expected Credit Losses        
Balance at beginning of period 21 18 22 13
Change for provision of expected credit losses 1 (3) 0 2
Balance at end of period $ 22 $ 15 $ 22 $ 15