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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Schedule of Premium Revenue by Health Plan Type [Line Items]
Service revenue relating to unsatisfied performance obligations	$ 571
Amounts due government agencies	1,714	$ 1,542
Risk adjustment receivable (payable)	1,129	912
Restricted cash and cash equivalents	95		$ 95
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	148	$ 135
CMS Subsidies
Schedule of Premium Revenue by Health Plan Type [Line Items]
Operating expense	$ 70

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