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Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Final maturities of investments									10 years
Average maturity of investments									3 years
Amounts due government agencies	$ 1,542,000,000				$ 1,202,000,000				$ 1,542,000,000	$ 1,202,000,000
Premium revenue									18,854,000,000	16,445,000,000	$ 13,261,000,000
Accounts payable	366,000,000				385,000,000				366,000,000	385,000,000
Revenues	4,949,000,000	$ 5,031,000,000	$ 4,999,000,000	$ 4,904,000,000	4,534,000,000	$ 4,546,000,000	$ 4,359,000,000	$ 4,343,000,000	19,883,000,000	17,782,000,000	14,178,000,000
Risk corridor payments not yet recorded	128,000,000								128,000,000
Medical administrative costs									554,000,000	488,000,000	398,000,000
Premium deficiency recorded	0				30,000,000				0	30,000,000
Additional medical care costs incurred, due to federal government ceasing payments	73,000,000
Health Plans
Property, Plant and Equipment [Line Items]
Premium revenue									18,854,000,000	16,445,000,000	13,261,000,000
Revenues									19,352,000,000	17,234,000,000	13,917,000,000
Medicaid Expansion
Property, Plant and Equipment [Line Items]
Amounts due government agencies	96,000,000				244,000,000				96,000,000	244,000,000
Florida | Health Plans
Property, Plant and Equipment [Line Items]
Premium revenue									2,568,000,000	1,938,000,000	1,199,000,000
New Mexico | Health Plans
Property, Plant and Equipment [Line Items]
Premium revenue									1,368,000,000	1,305,000,000	1,237,000,000
Texas | Health Plans
Property, Plant and Equipment [Line Items]
Premium revenue									2,813,000,000	2,461,000,000	$ 1,963,000,000
Medical Premium Liability Due to Agency
Property, Plant and Equipment [Line Items]
Medical premium liability based on medical costs threshold	$ 135,000,000				$ 272,000,000				$ 135,000,000	$ 272,000,000
Minimum | California, Illinois, New Mexico, Ohio, South Carolina, Texas, Washington, and Wisconsin
Property, Plant and Equipment [Line Items]
Percentage of additional incremental revenue earned									1.00%
Maximum | California, Illinois, New Mexico, Ohio, South Carolina, Texas, Washington, and Wisconsin
Property, Plant and Equipment [Line Items]
Percentage of additional incremental revenue earned									3.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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