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Segment Information - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 4,664	$ 4,697	$ 4,883	$ 4,646	$ 4,949	$ 5,031	$ 4,999	$ 4,904	$ 18,890	$ 19,883	$ 17,782
Margin	664	$ 566	$ 673	$ 615	446	$ 564	$ 254	$ 546	2,518	1,810	1,725
Goodwill and intangible assets, net	190				255				190	255	760
Total assets	7,154				8,471				7,154	8,471	7,449
Health Plans
Segment Reporting Information [Line Items]
Total revenue									18,471	19,352	17,234
Goodwill and intangible assets, net	190				212				190	212	513
Total assets	6,165				6,347				6,165	6,347	5,897
Other
Segment Reporting Information [Line Items]
Total revenue									419	531	548
Margin									43	29	54
Goodwill and intangible assets, net	0				43				0	43	247
Total assets	$ 989				$ 2,124				$ 989	$ 2,124	$ 1,552

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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