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Debt - Long-Term Debt Table (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
$ / shares
$ / €
Dec. 31, 2014
USD ($)
$ / €
Dec. 31, 2006
USD ($)
$ / €
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount $ (188) $ (231)  
Long-term Debt 11,544 11,535  
Current maturities of long-term debt, net (889) (381)  
Long-term debt, net $ 10,655 11,154  
Credit Facility Commitment Period 10 years    
Revolving Credit Facility [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0    
Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount (181) (224)  
Line of Credit [Member] | Revolving Credit Facility [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0 0  
Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Percentage Of Principal Amount Of Notes For Repurchase Requirement Of Contingent Convertible Senior Notes 100.00%    
Debt Instrument, Convertible, Terms of Conversion Feature 5 days    
Credit Facility Commitment Period 10 years    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00%    
Debt Instrument, Redemption, Period One [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Credit Facility Commitment Period 5 years    
Debt Instrument, Redemption, Period Two [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Credit Facility Commitment Period 10 years    
Debt Instrument, Redemption, Period Three [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Credit Facility Commitment Period 15 years    
Debt Instrument, Redemption, Period Four [Member] | Convertible Debt [Member]      
Long-Term Debt Instrument [Line Items]      
Credit Facility Commitment Period 20 years    
Interest Rate Contract [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 8 10  
3.25% Senior Notes due 2016 [Member]      
Long-Term Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.25%    
3.25% Senior Notes due 2016 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 500 500  
Debt Instrument, Interest Rate, Stated Percentage 3.25%    
6.25% Euro-Denominated Senior Notes Due 2017 [ Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 384 $ 416 $ 344
6.25% Euro-Denominated Senior Notes Due 2017 [ Member] | Cross Currency Interest Rate Contract [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 384    
Derivative, Forward Exchange Rate | $ / € 1.1147 1.2098 1.3325
Debt Instrument, Interest Rate, Stated Percentage 6.25%    
6.5% Senior Notes Due 2017 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 660 $ 660  
Debt Instrument, Interest Rate, Stated Percentage 6.50%    
7.25% Senior Notes Due 2018 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 669 669  
Debt Instrument, Interest Rate, Stated Percentage 7.25%    
Floating Rate Senior Notes due 2019 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,500 1,500  
6.625% Senior Notes Due 2020 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,300 1,300  
Debt Instrument, Interest Rate, Stated Percentage 6.625%    
6.875% Senior Notes Due 2020 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 500 500  
Debt Instrument, Interest Rate, Stated Percentage 6.875%    
6.125% Senior Notes Due 2021 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,000 1,000  
Debt Instrument, Interest Rate, Stated Percentage 6.125%    
5.375% Senior Notes due 2021 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 700 700  
Debt Instrument, Interest Rate, Stated Percentage 5.375%    
4.875% Senior Notes due 2022 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,500 1,500  
Debt Instrument, Interest Rate, Stated Percentage 4.875%    
5.75% Senior Notes due 2023 [Member] | Senior Notes [Member]      
Long-Term Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,100 1,100  
Debt Instrument, Interest Rate, Stated Percentage 5.75%    
2.75% Contingent Convertible Senior Notes Due 2035 [Member]      
Long-Term Debt Instrument [Line Items]      
Common Stock Price Conversion Thresholds | $ / shares $ 45.14    
Debt Instrument, Date of First Required Payment May 14, 2016    
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, Unamortized Discount $ (7) (15)  
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%    
2.5% Contingent Convertible Senior Notes due 2037 [Member]      
Long-Term Debt Instrument [Line Items]      
Common Stock Price Conversion Thresholds | $ / shares $ 59.44    
Debt Instrument, Date of First Required Payment Nov. 14, 2017    
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%    
2.25% Contingent Convertible Senior Notes Due 2038 [Member]      
Long-Term Debt Instrument [Line Items]      
Common Stock Price Conversion Thresholds | $ / shares $ 100.35    
Debt Instrument, Date of First Required Payment Jun. 14, 2019    
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%