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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Credit Loss [Abstract]    
Balance at beginning of period $ 3,625 $ 2,633
Balance at end of period 4,513 3,224
Allowance for Expected Credit Losses    
Balance at beginning of period 35 40
Change for provision of expected credit losses [1] 1 (1)
Balance at end of period 36 39
Premium receivable, write-offs during the period $ 1 $ 2
[1] Amounts deemed uncollectible are written-off in operating expenses. For the 2023 first quarter and 2022 first quarter, amounts written off were $1 million and $2 million, respectively.