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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Credit Loss [Abstract]        
Balance at beginning of period $ 9,044 $ 7,473 $ 8,260 $ 7,064
Balance at end of period 9,070 7,948 9,070 7,948
Allowance for Expected Credit Losses        
Balance at beginning of period 19 20 17 21
Change for provision of expected credit losses 0 (3) 2 (4)
Balance at end of period $ 19 $ 17 $ 19 $ 17