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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Credit Loss [Abstract]        
Balance at beginning of period $ 8,969 $ 7,509 $ 8,260 $ 7,064
Balance at end of period 9,044 7,473 9,044 7,473
Allowance for Expected Credit Losses        
Balance at beginning of period 17 16 17 21
Change for provision of expected credit losses 2 4 2 (1)
Balance at end of period $ 19 $ 20 $ 19 $ 20