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Summary of Net Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Finite Lived Intangible Assets [Line Items] |  |
Net Intangible Assets | $ 220 | $ 228
Tradenames |  |
Finite Lived Intangible Assets [Line Items] |  |
Net Intangible Assets | 124 | 124
Medicare Licenses |  |
Finite Lived Intangible Assets [Line Items] |  |
Net Intangible Assets | 57 | 57
Certificates of Need |  |
Finite Lived Intangible Assets [Line Items] |  |
Net Intangible Assets | 12 | 12
Contract Relationships and Other |  |
Finite Lived Intangible Assets [Line Items] |  |
Net Intangible Assets | $ 27 | $ 35

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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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