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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Schedule of Premium Revenue by Health Plan Type [Line Items]
Amounts due government agencies		$ 1,324		$ 1,202
Premium deficiency reserve		70	$ 100	30
Premium deficiency reserve, projected increase		55
Premium deficiency reserve, impact from change in computation		125
Medicaid Expansion
Schedule of Premium Revenue by Health Plan Type [Line Items]
Amounts due government agencies		82		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		119		$ 272
CMS Subsidies
Schedule of Premium Revenue by Health Plan Type [Line Items]
Accounts payable, related parties		$ 220
CMS Subsidies | Forecast
Schedule of Premium Revenue by Health Plan Type [Line Items]
Operating expense	$ 85

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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 210.7-03.15(a))
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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