Business Combinations H&N Acquisition Narrative (Details) - Successor [Member] - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended
	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2017	Nov. 01, 2017	Aug. 31, 2017
Business Acquisition [Line Items]
Net Sales	$ 1,735		$ 5,318	$ 7,053
(Loss) Income from Continuing Operations before Income Taxes				(1,586)
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold	$ 360		1,109	1,469
Goodwill		$ 45,589	$ 45,589	$ 45,589		$ 45,105
H&N Business [Member]
Business Acquisition [Line Items]
Net Sales		102
(Loss) Income from Continuing Operations before Income Taxes		(12)
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Inventory, Finished Goods					$ 153
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Inventory, Semi-finished goods					85
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Raw Materials and stores and supplies					76
Business Combination, Fair Value Step Up Of Acquired Inventory					100
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold		$ 35
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					505
Goodwill					718
Business Acquisition, Goodwill, Expected Tax Deductible Amount					208
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					435
H&N Business [Member] | Machinery and Equipment [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					372
H&N Business [Member] | Building [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					63
H&N Business [Member] | Land and Land Improvements [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					39
H&N Business [Member] | Construction in Progress [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					31
H&N Business [Member] | Customer-Related Intangible Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					268
H&N Business [Member] | Developed Technology Rights [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					130
H&N Business [Member] | Trademarks and Trade Names [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					$ 37