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Medical Claims and Benefits Payable - Incurred Claims and Allocated Adjustment Expense (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 17,073 | $ 14,774 | $ 11,794
Incurred Claims and Allocated Claims Adjustment Expenses | 44,069 |  |
Total IBNP | 1,717 | 1,352 | 1,191
Benefit Year 2015 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | 11,939 | 11,928 | $ 12,113
Total IBNP | $ 6 |  |
Cumulative number of reported claims (in claim) | claim | 84,000,000 |  |
Benefit Year 2016 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 15,093 | $ 15,064 |
Total IBNP | $ 46 |  |
Cumulative number of reported claims (in claim) | claim | 109,000,000 |  |
Benefit Year 2017 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 17,037 |  |
Total IBNP | $ 1,665 |  |
Cumulative number of reported claims (in claim) | claim | 114,000,000 |  |

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- Definition Liability For Unpaid Claims And Claims Adjustment Expense, Incurred Claims Including Acquisition Adjustment + References No definition available. + 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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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + 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 + Details
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- Definition Number of reported claims for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671317-158438 + Details
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