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Goodwill and Intangible Assets - Intangible Assets Balances (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Cost | $ 326 | $ 276
Accumulated Amortization | 186 | 154
Carrying Amount | 140 | 122
Contract rights and licenses |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Cost | 267 | 224
Accumulated Amortization | 148 | 120
Carrying Amount | 119 | 104
Customer relationships |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Cost | 25 | 25
Accumulated Amortization | 24 | 23
Carrying Amount | 1 | 2
Provider network |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Cost | 34 | 27
Accumulated Amortization | 14 | 11
Carrying Amount | $ 20 | $ 16

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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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