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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium deficiency reserve	$ 22		$ 30
Amounts due government agencies	1,575		1,202
Total revenue	4,904	$ 4,343
Retained earnings	887		810
Adjustment | Accounting Standards Update 2014-09
Schedule of Premium Revenue by Health Plan Type [Line Items]
Retained earnings	50
Florida | Adjustment
Schedule of Premium Revenue by Health Plan Type [Line Items]
Total revenue		$ 18
Medicaid Expansion
Schedule of Premium Revenue by Health Plan Type [Line Items]
Amounts due government agencies	245		244
Medical Premium Liability Due to Agency
Schedule of Premium Revenue by Health Plan Type [Line Items]
Medical premiums liability based on medical cost thresholds	$ 262		$ 272

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(a)(4))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 505
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-Name Accounting Standards Codification
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-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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