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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Premium Revenue by Health Plan Type [Line Items]
Amounts due government agencies	$ 1,746	$ 1,542
Risk adjustment receivable (payable)	1,159	912
Service revenue relating to unsatisfied performance obligations	638
Restricted cash and cash equivalents	98		$ 92
Medicaid Expansion
Schedule of Premium Revenue by Health Plan Type [Line Items]
Amounts due government agencies	97	96
Medical Premium Liability Due to Agency
Schedule of Premium Revenue by Health Plan Type [Line Items]
Medical premiums liability based on medical cost thresholds	144	$ 135
CMS Subsidies
Schedule of Premium Revenue by Health Plan Type [Line Items]
Operating expense	$ 76

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