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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Credit Loss [Abstract]        
Balance at beginning of period $ 7,067 $ 6,268 $ 5,634 $ 4,644
Balance at end of period 6,450 6,364 6,450 6,364
Allowance for Expected Credit Losses        
Balance at beginning of period 46 36 45 34
Provision on business acquired [1]   16   16
Change for provision of expected credit losses [2] 8 0 9 2
Balance at end of period 54 52 54 52
Premium receivable, write-offs during the period $ 0 $ 1 $ 1 $ 1
[1] Represents MCE’s provision for current expected credit losses on premiums receivable.
[2] Amounts deemed uncollectible are written-off in operating expenses. For the 2025 third quarter and 2024 third quarter, amounts written off were nil and $1 million, respectively. For the nine months ended September 30, 2025 and 2024 period, amounts written off were $1 million and $1 million, respectively