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Medical Claims and Benefits Payable - Cumulative Paid Claims and Allocated Claims Adjustment Expenses (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Product Information [Line Items] |  |  |
Claims paid | $ 42,014 |  |
Benefit Year 2015 |  |  |
Product Information [Line Items] |  |  |
Claims paid | 11,932 | $ 11,906 | $ 10,615
Benefit Year 2016 |  |  |
Product Information [Line Items] |  |  |
Claims paid | 14,952 | $ 13,403 |
Benefit Year 2017 |  |  |
Product Information [Line Items] |  |  |
Claims paid | $ 15,130 |  |

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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671311-158438 + Details
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