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Medical Claims and Benefits Payable - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Other Liabilities Disclosure [Abstract] |  |  |
Non-risk provider payables | $ 146 |  | $ 122
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Expense (recovery) for prior period claims development | $ 241 | $ 142 |
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 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 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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