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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Credit Loss [Abstract]    
Balance at beginning of period $ 4,644 $ 3,625
Balance at end of period 5,765 4,513
Allowance for Expected Credit Losses    
Balance at beginning of period 34 35
Change for provision of expected credit losses [1] (2) 1
Balance at end of period 32 36
Premium receivable, write-offs during the period $ 0 $ 1
[1] Amounts deemed uncollectible are written-off in operating expenses. For the 2024 first quarter and 2023 first quarter, amounts written off were nil and $1 million, respectively.