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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Successor [Member]    
Restricted Cash $ 500 $ 558
Percentage of FIFO Inventory 50.00% 60.00%
Percentage of Weighted Average Cost Inventory 35.00% 30.00%
Percentage of LIFO Inventory 15.00% 10.00%
Successor [Member] | Minimum [Member]    
Definite-Lived Intangible Asset, Useful Life 1 year  
Successor [Member] | Maximum [Member]    
Definite-Lived Intangible Asset, Useful Life 23 years  
Other Current Assets [Member]    
Prepaid Royalties $ 239  
Restricted Cash 500 $ 558
Other Noncurrent Assets [Member]    
Prepaid Royalties $ 1,139