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Goodwill and Intangible Assets, Net - Balances of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Historical goodwill		$ 678
Accumulated impairment losses	$ (492)	(492)
Changes in the carrying amount of goodwill
Beginning balance	186
Sale of subsidiary	(43)
Ending balance	143
Health Plans
Goodwill [Line Items]
Historical goodwill		445
Accumulated impairment losses	(302)	(302)
Changes in the carrying amount of goodwill
Beginning balance	143
Sale of subsidiary	0
Ending balance	143
Other
Goodwill [Line Items]
Historical goodwill		233
Accumulated impairment losses	(190)	$ (190)
Changes in the carrying amount of goodwill
Beginning balance	43
Sale of subsidiary	(43)
Ending balance	$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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+ References

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