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Medical Claims and Benefits Payable - Additional Information (Details) member in Millions, $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) member | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Other Liabilities Disclosure [Abstract] |  |  |
Non-risk provider payables | $ 111 |  | $ 225
Reinsurance recoverables | 65 |  | $ 83
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Expense (recovery) for prior period claims development | $ (31) | $ (189) |
Number of members added, approximately | member | 0.4 |  |
Minimum |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Percentage of IBNP not expected to be paid | 8.00% |  |
Maximum |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Percentage of IBNP not expected to be paid | 10.00% |  |

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- Definition Medical Claims and Benefits Payable + References No definition available. + Details
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- Definition Short-Duration Insurance Contracts, Liability For Unpaid Claims And Claims Adjustment Expense, Uncollectible Claims Assumption + References No definition available. + Details
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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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