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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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Other Liabilities Disclosure [Abstract] |  |  |  |
Fee-for-service claims incurred but not paid (IBNP) | $ 1,478 | $ 1,352 |  |
Pharmacy payable | 121 | 112 |  |
Capitation payable | 45 | 37 |  |
Other | 433 | 428 |  |
Medical claims and benefits payable | $ 2,077 | $ 1,929 | $ 1,766 | $ 1,685

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- Definition Capitation Claims Payable + References No definition available. + Details
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- Definition Other Claims Payable + References No definition available. + Details
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- Definition Pharmacy Claims Payable + 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://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 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 + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
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- References No definition available. + Details
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