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Medical Claims and Benefits Payable - Additional Information (Details) member in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) member | Dec. 31, 2015 USD ($) member
Insurance Claims [Line Items] |  |  |
Medical claims and benefits payable | $ | $ 122 | $ 225 | $ 167
Reinsurance recoverable for unpaid claims | $ | 16 | 61 | 46
Prior period claims expense (benefit) recognized | $ | $ 36 | $ (192) | $ (141)
Minimum |  |  |
Insurance Claims [Line Items] |  |  |
Estimated discount percentage of final payment on claims incurred but not paid | 8.00% |  |
Maximum |  |  |
Insurance Claims [Line Items] |  |  |
Estimated discount percentage of final payment on claims incurred but not paid | 10.00% |  |
Ohio | Medicaid Expansion |  |  |
Insurance Claims [Line Items] |  |  |
Number of members added, approximately (in member) | member |  |  | 61
Ohio | MMP Program |  |  |
Insurance Claims [Line Items] |  |  |
Number of members added, approximately (in member) | member |  |  | 17
California | Medicaid Expansion |  |  |
Insurance Claims [Line Items] |  |  |
Number of members added, approximately (in member) | member |  | 55 | 100

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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