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Shareholders' Equity Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2017
Nov. 21, 2016
Jun. 30, 2016
Jun. 07, 2016
Class of Warrant or Right [Line Items]            
Debt Instrument, Face Amount         $ 2  
Capital in Excess of Par Value $ 6,571   $ 6,655 $ 271    
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          
Warrants and Rights Outstanding $ 156   $ 70      
Common Shares, Par Value (in USD per share) $ 0.001   $ 0.001      
Additional Paid-in Capital [Member]            
Class of Warrant or Right [Line Items]            
Stock Issued During Period, Shares, New Issues 84,500,000 115,000,000        
Additional Paid in Capital   $ 623        
Exchangeable Debt [Member]            
Class of Warrant or Right [Line Items]            
Debt Instrument, Face Amount           $ 1,265
Capital in Excess of Par Value           $ 97
Not Designated as Hedging Instrument [Member] | Warrant [Member] | Other Noncurrent Liabilities [Member]            
Class of Warrant or Right [Line Items]            
Derivative Liability, Fair Value, Gross Liability $ 156