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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Credit Loss [Abstract]    
Balance at beginning of period $ 5,634 $ 4,644
Balance at end of period 5,723 5,634
Allowance for Expected Credit Losses    
Balance at beginning of period 45 34
Provision on business acquired [1]   16
Change for provision of expected credit losses [2] (2) (5)
Balance at end of period 43 45
Write-offs charged against the allowance $ 3 $ 3
[1] Reflects provision for current expected credit losses on premiums receivable related to the MCE Acquisition.
[2] Amounts deemed uncollectible are written-off in operating expenses. For the 2025 and 2024 periods, amounts written off totaled $3 million and $3 million, respectively.