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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 |

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- Definition Amount before 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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