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
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

Defined Benefit Plan, Plan With Benefit Obligation In Excess Of Plan Assets, Accumulated Benefit Obligations

No definition available.

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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

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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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