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Commitments and Contingencies - Additional Information (Details) member in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) member Lease_Renewal_Option | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Sale Leaseback Transaction [Line Items] |  |  |
Net assets of subsidiaries subject to restrictions | $ 1,691 | $ 1,492 |
Aggregate statutory capital and surplus | 1,777 |  |
Required minimum statutory capital surplus | 1,186 |  |
Premium revenue | 18,854 | 16,445 | $ 13,261
Rental expense related to leases | $ 75 | 64 | 44
Minimum |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Operating lease terms | 5 years |  |
Operating lease renewal options | Lease_Renewal_Option | 1 |  |
Maximum |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Operating lease terms | 10 years |  |
Operating lease renewal options | Lease_Renewal_Option | 2 |  |
Health Plans |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Premium revenue | $ 18,854 | 16,445 | 13,261
Puerto Rico |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Number of members served, approximately (in member) | member | 314 |  |
Puerto Rico | Health Plans |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Premium revenue | $ 732 | 726 | $ 567
Parent Company |  |  |
Sale Leaseback Transaction [Line Items] |  |  |
Cash and investments | $ 696 | $ 264 |

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of insurance premium revenue recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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