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Commitments and Contingencies - Additional Information (Details) member in Thousands, $ in Millions	12 Months Ended
	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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Health Care Organization, Number of Members

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Operating Lease, Number of Renewal Option

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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))
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Amount of insurance premium revenue recognized.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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-Publisher FASB
-Name Accounting Standards Codification
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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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-Publisher FASB
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Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices.

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