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Health Care Costs Payable - Components of Change in Health Care Costs Payable (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Health care costs payable, beginning of the period, net | $ 6,879 |
Less: Claims paid |  |
Health care costs payable, end of the period, net | 7,593 |
Health Insurance Product Line |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Health care costs payable, beginning of the period | 6,879 | $ 6,147
Less: Reinsurance recoverables | 5 | 4
Health care costs payable, beginning of the period, net | 6,874 | 6,143
Acquisition | 444 | 0
Add: Components of incurred health care costs |  |
Current year | 40,777 | 39,657
Prior years | (448) | (511)
Total incurred health care costs | 40,329 | 39,146
Less: Claims paid |  |
Current year | 34,198 | 33,032
Prior years | 5,865 | 5,253
Total claims paid | 40,063 | 38,285
Add: Premium deficiency reserve | 1 | 6
Health care costs payable, end of the period, net | 7,585 | 7,010
Add: Reinsurance recoverables | 8 | 4
Health care costs payable, end of the period | 7,593 | 7,014
Premium deficiency reserve | 1 | 6
Health Care Benefits |  |
Less: Claims paid |  |
Benefit costs recorded in other insurance liabilities | 31 | 31
Corporate / Other |  |
Less: Claims paid |  |
Benefit costs recorded in other insurance liabilities | $ 173 | $ 213

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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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- Definition Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported. + References No definition available. + Details
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