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Allowance for Expected Credit Losses
9 Months Ended
Sep. 30, 2023
Credit Loss [Abstract]  
Allowance for expected credit losses
Premiums Receivable
The following table provides a roll forward of the allowance for expected credit losses of the Company’s premium receivables:
Premium Receivables, Net of AllowanceAllowance for Expected Credit Losses
Three Months Ended September 30, 2023
Balance at beginning of period$5,296 $34 
Change for provision of expected credit losses (1) $— 
Balance at end of period$4,937 $34 
Three Months Ended September 30, 2022
Balance at beginning of period$3,634 $38 
Change for provision of expected credit losses (1) $— 
Balance at end of period$3,579 $38 
Nine Months Ended September 30, 2023
Balance at beginning of period$3,625 $35 
Change for provision of expected credit losses (1) (1)
Balance at end of period$4,937 $34 
Nine Months Ended September 30, 2022
Balance at beginning of period$2,633 $40 
Change for provision of expected credit losses (1)
(2)
Balance at end of period$3,579 $38 
(1)Amounts deemed uncollectible are written-off in operating expenses. For the 2023 third quarter and 2022 third quarter, amounts written off were nil and $2 million, respectively. For the nine months ended September 30, 2023 and 2022 period, amounts written off were $2 million and $7 million, respectively.
Reinsurance Recoverables
The following table provides a roll forward of the allowance for expected credit losses of the Company’s reinsurance recoverables:
Reinsurance Recoverables, Net of AllowanceAllowance for Expected Credit Losses
Three Months Ended September 30, 2023
Balance at beginning of period$6,717 $22 
Change for provision of expected credit losses
Balance at end of period$6,821 $23 
Three Months Ended September 30, 2022
Balance at beginning of period$5,939 $15 
Change for provision of expected credit losses
Balance at end of period$6,356 $17 
Nine Months Ended September 30, 2023
Balance at beginning of period$6,564 $22 
Change for provision of expected credit losses
Balance at end of period$6,821 $23 
Nine Months Ended September 30, 2022
Balance at beginning of period$5,881 $13 
Change for provision of expected credit losses
Balance at end of period$6,356 $17 
The following table summarizes the Company’s reinsurance recoverables on paid and unpaid losses (not including ceded unearned premiums):
September 30,
December 31
20232022
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses$6,821$6,564
% due from carriers with A.M. Best rating of “A-” or better66.7 %68.8 %
% due from all other rated carriers0.2 %0.1 %
% due from all other carriers with no A.M. Best rating (1)33.1 %31.1 %
Largest balance due from any one carrier as % of total shareholders’ equity8.3 %9.0 %
(1)    At September 30, 2023 and December 31, 2022 over 95% of such amount were collateralized through reinsurance trusts, funds withheld arrangements, letters of credit or other, respectively.
Contractholder Receivables
The following table provides a roll forward of the allowance for expected credit losses of the Company’s contractholder receivables:
Contract-holder Receivables, Net of AllowanceAllowance for Expected Credit Losses
Three Months Ended September 30, 2023
Balance at beginning of period$1,761 $
Change for provision of expected credit losses— 
Balance at end of period$1,805 $
Three Months Ended September 30, 2022
Balance at beginning of period$1,758 $
Change for provision of expected credit losses(1)
Balance at end of period1,736 $
Nine Months Ended September 30, 2023
Balance at beginning of period$1,731 $
Change for provision of expected credit losses— 
Balance at end of period$1,805 $
Nine Months Ended September 30, 2022
Balance at beginning of period$1,829 $
Change for provision of expected credit losses(1)
Balance at end of period1,736 $