XML 103 R51.htm IDEA: XBRL DOCUMENT v3.2.0.727
Debt - Senior Notes and Contingent Convertible Senior Notes Purchased Narrative (Details) - USD ($)
$ in Millions
Jul. 17, 2015
Jun. 30, 2015
Dec. 31, 2014
Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent   100.00%  
Minimum [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross   $ 50  
Maximum [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross   75  
2.5% Contingent Convertible Senior Notes due 2037 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross   $ 1,168 $ 1,168
Debt Instrument, Interest Rate, Stated Percentage   2.50%  
2.5% Contingent Convertible Senior Notes due 2037 [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.50%  
Debt Instrument, Interest Rate, Effective Percentage   8.00%  
2.75% Contingent Convertible Senior Notes Due 2035 [Member]      
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.75%  
2.75% Contingent Convertible Senior Notes Due 2035 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross   $ 396 396
Debt Instrument, Interest Rate, Stated Percentage   2.75%  
2.75% Contingent Convertible Senior Notes Due 2035 [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.75%  
Debt Instrument, Interest Rate, Effective Percentage   6.86%  
2.25% Contingent Convertible Senior Notes Due 2038 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross   $ 347 $ 347
Debt Instrument, Interest Rate, Stated Percentage   2.25%  
2.25% Contingent Convertible Senior Notes Due 2038 [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.25%  
Debt Instrument, Interest Rate, Effective Percentage   8.00%  
6.775% Senior Notes Due 2019 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.775%  
6.775% Senior Notes Due 2019 [Member] | Senior Notes [Member] | Subsequent Event [Member]      
Long-Term Debt Instrument [Line Items]      
Loss Contingency, Damages Awarded, Value $ 380    
Loss Contingency, Prejudgment Interest Awarded $ 59