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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Credit Loss [Abstract]        
Balance at beginning of period $ 6,607 $ 5,765 $ 5,634 $ 4,644
Balance at end of period 7,067 6,268 7,067 6,268
Allowance for Expected Credit Losses        
Balance at beginning of period 43 32 45 34
Change for provision of expected credit losses [1] 3 4 1 2
Balance at end of period 46 36 46 36
Premium receivable, write-offs during the period $ 1 $ 0 $ 1 $ 0
[1] Amounts deemed uncollectible are written-off in operating expenses. For the 2025 second quarter and 2024 second quarter, amounts written off were $1 million and nil, respectively. For the six months ended June 30, 2025 and 2024 period, amounts written off were $1 million and nil, respectively