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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Credit Loss [Abstract]        
Balance at beginning of period $ 4,513 $ 3,224 $ 3,625 $ 2,633
Balance at end of period 5,296 3,634 5,296 3,634
Allowance for Expected Credit Losses        
Balance at beginning of period 36 39 35 40
Change for provision of expected credit losses [1] (2) (1) (1) (2)
Balance at end of period 34 38 34 38
Premium receivable, write-offs during the period $ 1 $ 3 $ 2 $ 5
[1] Amounts deemed uncollectible are written-off in operating expenses. For the 2023 second quarter and 2022 second quarter, amounts written off were $1 million and $3 million, respectively. For the six months ended June 30, 2023 and 2022 period, amounts written off were $2 million and $5 million, respectively.