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Shareholders' Equity Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Nov. 21, 2016
Mar. 31, 2016
Dec. 31, 2016
Jun. 30, 2016
Jun. 07, 2016
Dec. 31, 2015
Jun. 17, 2014
Class of Warrant or Right [Line Items]              
Debt Instrument, Face Amount       $ 2      
Capital in Excess of Par Value $ 271   $ 6,571     $ 5,502  
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 $ 172   $ 156        
Common Shares, Par Value (in USD per share)     $ 0.001     $ 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          
Sale of Stock [Domain]              
Class of Warrant or Right [Line Items]              
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