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Health Care Costs Payable
9 Months Ended
Sep. 30, 2020
Health Care and Other Insurance Liabilities [Abstract]  
Health Care Costs Payable Health Care Costs Payable
The following table shows the components of the change in health care costs payable during the nine months ended September 30, 2020 and 2019:
Nine Months Ended
September 30,
In millions20202019
Health care costs payable, beginning of the period$6,879 $6,147 
Less: Reinsurance recoverables
Health care costs payable, beginning of the period, net6,874 6,143 
Acquisition444 — 
Add: Components of incurred health care costs
  Current year40,777 39,657 
  Prior years(448)(511)
Total incurred health care costs (1)
40,329 39,146 
Less: Claims paid
  Current year34,198 33,032 
  Prior years5,865 5,253 
Total claims paid40,063 38,285 
Add: Premium deficiency reserve
Health care costs payable, end of the period, net7,585 7,010 
Add: Reinsurance recoverables
Health care costs payable, end of the period$7,593 $7,014 
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(1)Total incurred health care costs for the nine months ended September 30, 2020 and 2019 in the table above exclude (i) $1 million and $6 million, respectively, related to a premium deficiency reserve related to the Company’s Medicaid products, (ii) $31 million and $31 million, respectively, of benefit costs recorded in the Health Care Benefits segment that are included in other insurance liabilities on the Company’s unaudited condensed consolidated balance sheets and (iii) $173 million and $213 million, respectively, of benefit costs recorded in the Corporate/Other segment that are included in other insurance liabilities on the Company’s unaudited condensed consolidated balance sheets.

The Company’s estimates of prior years’ health care costs payable decreased by $448 million and $511 million, respectively, in the nine months ended September 30, 2020 and 2019, because claims were settled for amounts less than originally estimated (i.e., the amount of claims incurred was lower than originally estimated), primarily due to lower health care cost trends as well as the actual claim submission time being faster than originally assumed (i.e., the Company’s completion factors were higher than originally assumed) in estimating health care costs payable at the end of the prior year.

At September 30, 2020, the Company’s liabilities for the ultimate cost of (i) services rendered to the Company’s Insured members but not yet reported to the Company and (ii) claims which have been reported to the Company but not yet paid (collectively, “IBNR”) plus expected development on reported claims totaled approximately $5.8 billion. Substantially all of the Company’s liabilities for IBNR plus expected development on reported claims at September 30, 2020 related to the current year.