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Goodwill and Other Intangible Assets Narrative (Details) - Successor [Member] - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Sep. 30, 2018
[1]
Dec. 31, 2017
Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items]      
Goodwill Impairment Charge $ 4,503 $ 0 $ 4,503
Restructuring and Asset Related Charges - Net [Member] | In Process Research and Development [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     85
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill), After Tax     $ 66
[1] See Note 14 for additional information