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Goodwill and Intangible Assets, Net - Intangible Assets Balances (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Cost | $ 221 | $ 326
Accumulated Amortization | 152 | 186
Carrying Amount | 69 | 140
Contract rights and licenses |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Cost | 201 | 267
Accumulated Amortization | 141 | 148
Carrying Amount | 60 | 119
Customer relationships |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Cost |  | 25
Accumulated Amortization |  | 24
Carrying Amount |  | 1
Provider network |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Cost | 20 | 34
Accumulated Amortization | 11 | 14
Carrying Amount | $ 9 | $ 20

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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