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Restructuring and Asset Related Charges 2014 Restructuring Program (Details) - 2014 Restructuring Program [Member] - USD ($) $ in Millions | 4 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Successor [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve, Other Adjustment | $ (2) |  |
Predecessor [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve, Other Adjustment |  | $ (21) | $ (21)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Details
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- Details
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