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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Successor [Member]    
Restricted Cash $ 558  
Percentage of FIFO Inventory 60.00%  
Percentage of Weighted Average Cost Inventory 30.00%  
Percentage of LIFO Inventory 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  
Predecessor [Member]    
Percentage of FIFO Inventory   55.00%
Percentage of Weighted Average Cost Inventory   30.00%
Percentage of LIFO Inventory   15.00%