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Health Care Costs Payable - Reconciliation of Health Care Costs Payable (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Health care costs payable, beginning of period, net | $ 6,879 |  |
Reclassification from pharmacy claims and discounts payable |  |  | $ 776
Less: Claims paid |  |  |
Health care costs payable, end of period, net | 7,936 | $ 6,879 |
Health Care Benefits |  |  |
Less: Claims paid |  |  |
Benefit costs recorded in other insurance liabilities | 41 | 41 | 4
Corporate/ Other |  |  |
Less: Claims paid |  |  |
Benefit costs recorded in other insurance liabilities | 221 | 285 | 22
Health Insurance Product Line |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Health care costs payable, beginning of period | 6,879 | 6,147 | 5
Less: Reinsurance recoverables | 5 | 4 | 0
Health care costs payable, beginning of period, net | 6,874 | 6,143 | 5
Acquisitions, net | 414 | 0 | 5,357
Reclassification from pharmacy claims and discounts payable | 0 | 0 | 776
Add: Components of incurred health care costs |  |  |
Current year | 55,835 | 52,723 | 6,594
Prior years | (429) | (524) | (42)
Total incurred health care costs | 55,406 | 52,199 | 6,552
Less: Claims paid |  |  |
Current year | 48,770 | 46,158 | 6,303
Prior years | 6,009 | 5,314 | 260
Total claims paid | 54,779 | 51,472 | 6,563
Add: Premium deficiency reserve | 11 | 4 | 16
Health care costs payable, end of period, net | 7,926 | 6,874 | 6,143
Add: Reinsurance recoverables | 10 | 5 | 4
Health care costs payable, end of period | $ 7,936 | $ 6,879 | $ 6,147

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- Definition The amount of reserves related to expected future claims, including maintenance costs (for example, direct costs such as claim processing costs), in excess of existing reserves plus anticipated future premiums and reinsurance recoveries. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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