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Fair Value of Financial Instruments, Assets and Equity Investements (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Nov. 21, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Jun. 17, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Common Shares, Par Value (in USD per share)     $ 0.001 $ 0.001 $ 0.001
Shares Issued, Price Per Share $ 5.40        
Class of Warrant or Right, Unissued 1        
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right 84,500,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 6.43        
Senior Notes [Member] | Level 2 [Member] | Fair Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value of Long-term debt     $ 6,739 $ 5,095  
Senior Notes [Member] | Level 2 [Member] | Carrying Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value of Long-term debt     $ 7,028 $ 6,099  
Additional Paid-in Capital [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Stock Issued During Period, Shares, New Issues 84,500,000 115,000,000