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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Credit Loss [Abstract]        
Balance at beginning of period $ 6,268 $ 5,296 $ 4,644 $ 3,625
Balance at end of period 6,364 4,937 6,364 4,937
Allowance for Expected Credit Losses        
Balance at beginning of period 36 34 34 35
Provision on business acquired [1] 16   16  
Change for provision of expected credit losses [2] 0 0 2 (1)
Balance at end of period 52 34 52 34
Premium receivable, write-offs during the period $ 1 $ 0 $ 1 $ 2
[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 2024 third quarter and 2023 third quarter, amounts written off were $1 million and nil, respectively. For the nine months ended September 30, 2024 and 2023 period, amounts written off were $1 million and $2 million, respectively.