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Pension Plans and Other Post Employment Benefit Plans Pension Plans with Projected Benefit Obligations in Excess of Plan Assets (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Successor [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Projected benefit obligations | $ 25,254 |
Accumulated benefit obligations | 24,864 |
Fair value of plan assets | $ 19,941 |
Predecessor [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Projected benefit obligations |  | $ 24,779
Accumulated benefit obligations |  | 24,297
Fair value of plan assets |  | $ 16,601

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- Definition Defined Benefit Plan, Plan With Benefit Obligation In Excess Of Plan Assets, Accumulated Benefit Obligations + References No definition available. + Details
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- Definition Defined Benefit Plan, Plan With Benefit Obligation In Excess Of Plan Assets, Projected Benefit Obligation + References No definition available. + Details
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- Definition Fair value of plan assets for defined benefit plan with benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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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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