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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2018
Property, Plant and Equipment [Line Items]
Final maturities of investments	10 years
Average maturity of investments	10 years
Medical premium liability based on medical costs threshold	$ 74	$ 103
Amounts due government agencies	664	967
Risk adjustment payable	368	466
Risk adjustment receivable	63	34
Risk adjustment, net payable	305	432
Prepaid reinsurance premiums	17	16	$ 20
Reinsurance recoveries	18	33	24
Reinsurance recoverable for unpaid claims adjustments	21	31	$ 16
Adoption of new accounting standard				$ 85	$ 6
Receivables from state and federal government agencies	1,406	1,330
Retained Earnings
Property, Plant and Equipment [Line Items]
Adoption of new accounting standard				85
Retained Earnings, Including Deferred Income Tax
Property, Plant and Equipment [Line Items]
Adoption of new accounting standard				110
Deferred Income Tax
Property, Plant and Equipment [Line Items]
Adoption of new accounting standard				$ 25
CMS Subsidies
Property, Plant and Equipment [Line Items]
Disposal group, operating expense		81
Medicaid Expansion
Property, Plant and Equipment [Line Items]
Amounts due government agencies	$ 69	87
Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
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
Property, Plant and Equipment [Line Items]
Useful life	15 years
Maximum | California, Illinois, New Mexico, Ohio, South Carolina, Texas, Washington, and Wisconsin
Property, Plant and Equipment [Line Items]
Percentage of additional incremental revenue earned	4.00%
Structured Securities
Property, Plant and Equipment [Line Items]
Average maturity of investments	10 years
Government receivables
Property, Plant and Equipment [Line Items]
Concentration risk, percentage	75.00%
Receivables from state and federal government agencies	$ 1,056	$ 872

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