Goodwill and Other Intangible Assets Goodwill (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Predecessor [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 4,543	$ 4,169	$ 4,238
Currency Translation Adjustment		176	(68)
Other Goodwill Adjustments and Acquisitions		198	(1)
Goodwill, Ending Balance		4,543	$ 4,169
Successor [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	45,105
Currency Translation Adjustment	(234)
Goodwill, Ending Balance	45,589	$ 45,105
Successor [Member] \| H&N Business [Member]
Goodwill [Line Items]
Goodwill Recognized for H&N Acquisition	$ 718

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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