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Debt - Senior Notes and Contingent Convertible Senior Notes Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Long-Term Debt Instrument [Line Items]        
Cash paid to purchase debt $ 1,500   $ 1,979 $ 0
Gains on purchases or exchanges of debt 87 $ 0 255 $ 0
Debt Instrument, Convertible, Carrying Amount of Equity Component $ 25   $ 25  
Noncontrolling Interest, Ownership Percentage by Parent 100.00%   100.00%  
Senior Notes Exchanged for Shares of Common Stock [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount $ 290   $ 290  
Debt Conversion, Converted Instrument, Shares Issued     53,923,925  
Contingent Convertible Senior Notes Exchanged for Shares of Common Stock [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount 287   $ 287  
Debt Conversion, Converted Instrument, Shares Issued     55,427,782  
Senior Notes, Retired with Proceeds from Term Loan [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount 898   $ 898  
Convertible Debt, Retired with Proceeds from Term Loan [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount 708   708  
Senior Notes [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount $ 181   181  
Cash paid to purchase debt     151  
Senior Notes [Member] | 3.25% Senior Notes due 2016 [Member]        
Long-Term Debt Instrument [Line Items]        
Cash paid to purchase debt     $ 259  
Debt Instrument, Interest Rate, Stated Percentage 3.25%   3.25%  
Convertible Debt [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Repurchased Face Amount $ 118   $ 118  
Cash paid to purchase debt     $ 63