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Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Entity Information [Line Items]
Premium revenue	$ 4,337	$ 4,777	$ 13,174	$ 14,165
Net assets of subsidiaries subject to restrictions	2,041		2,041		$ 1,691
Aggregate statutory capital and surplus	2,125		2,125
Required minimum statutory capital surplus	1,138		$ 1,138
California Department of Health Care Services
Entity Information [Line Items]
Premium revenue	$ (57)

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Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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