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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Credit Loss [Abstract]    
Balance at beginning of period $ 5,634 $ 4,644
Balance at end of period 6,607 5,765
Allowance for Expected Credit Losses    
Balance at beginning of period 45 34
Change for provision of expected credit losses [1] (2) (2)
Balance at end of period 43 32
Premium receivable, write-offs during the period $ 0 $ 0
[1] Amounts deemed uncollectible are written-off in operating expenses. For the 2025 first quarter and 2024 first quarter, amounts written off were nil.