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Health Care Costs Payable - Reconciliation of Health Care Costs Payable (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Nov. 28, 2018
Health Care And Other Insurance Liabilities [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | $ 5,357
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Health care costs payable, beginning of the period | $ 5 |
Less: Reinsurance recoverables | 0 |
Health care costs payable, beginning of the period, net | 5 |
Add: Components of incurred health care costs |  |
Current year | 6,594 |
Prior years | (42) |
Total incurred health care costs | 6,552 |
Less: Claims paid |  |
Current year | 6,464 |
Prior years | 260 |
Total claims paid | 6,724 |
Add: Premium deficiency reserve | 16 |
Health care costs payable, end of period, net | 5,206 |
Add: Reinsurance recoverables | 4 |
Health care costs payable, end of period | 5,210 |
Health Care Benefits |  |
Less: Claims paid |  |
Add: Reinsurance recoverables | 4 |
Corporate/Other |  |
Less: Claims paid |  |
Add: Reinsurance recoverables | $ 22 |

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- Definition Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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