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Debt - Long-Term Debt Table (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
$ / €
Sep. 30, 2016
USD ($)
$ / shares
$ / €
Dec. 31, 2015
USD ($)
$ / €
Dec. 31, 2006
$ / €
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 8,717 $ 8,717 $ 9,706  
Long-term Debt, Gross 9,678 9,678 10,692  
Deferred Long-term Liability Charges (49) (49) (43)  
Debt Instrument, Unamortized Discount (2) (2) (4)  
Long-term debt, current maturities including discount (662) (662) (381)  
Current maturities of long-term debt, net (656) (656) (381)  
Long-term Debt, Fair Value 8,055 8,055 9,325  
Long-term debt, net 9,022 $ 9,022 10,311  
Commitment Period   10 years    
Interest Rate Contract [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount 0 $ 0 0  
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge 6 $ 6 7  
2.75% Contingent Convertible Senior Notes Due 2035 [Member]        
Long-Term Debt Instrument [Line Items]        
Common Stock Price Conversion Thresholds | $ / shares   $ 45.02    
Debt Instrument, Date of First Required Payment   May 14, 2016    
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    
2.25% Contingent Convertible Senior Notes Due 2038 [Member]        
Long-Term Debt Instrument [Line Items]        
Common Stock Price Conversion Thresholds | $ / shares   $ 100.20    
Debt Instrument, Date of First Required Payment   Jun. 14, 2019    
Term Loan [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount 1,500 $ 1,500 0  
Long-term Debt, Gross $ 1,500 1,500 0  
Commitment Period 5 years      
Senior Notes [Member] | 3.25% Senior Notes due 2016 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 0 0 381  
Long-term Debt, Gross $ 0 $ 0 381  
Debt Instrument, Interest Rate, Stated Percentage 3.25% 3.25%    
Senior Notes [Member] | 6.25% Euro-Denominated Senior Notes Due 2017 [ Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 299 $ 299 329  
Long-term Debt, Gross $ 299 $ 299 $ 329  
Debt Instrument, Interest Rate, Stated Percentage 6.25% 6.25%    
Senior Notes [Member] | 6.25% Euro-Denominated Senior Notes Due 2017 [ Member] | Cross Currency Interest Rate Contract [Member]        
Long-Term Debt Instrument [Line Items]        
Derivative, Forward Exchange Rate | $ / € 1.1235 1.1235 1.0862 1.3325
Debt Instrument, Interest Rate, Stated Percentage 6.25% 6.25% 6.25%  
Senior Notes [Member] | 6.5% Senior Notes Due 2017 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 233 $ 233 $ 453  
Long-term Debt, Gross $ 233 $ 233 453  
Debt Instrument, Interest Rate, Stated Percentage 6.50% 6.50%    
Senior Notes [Member] | 7.25% Senior Notes Due 2018 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 460 $ 460 538  
Long-term Debt, Gross $ 460 $ 460 538  
Debt Instrument, Interest Rate, Stated Percentage 7.25% 7.25%    
Senior Notes [Member] | Floating Rate Senior Notes due 2019 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 504 $ 504 1,104  
Long-term Debt, Gross 504 504 1,104  
Senior Notes [Member] | 6.625% Senior Notes Due 2020 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount 807 807 822  
Long-term Debt, Gross $ 807 $ 807 822  
Debt Instrument, Interest Rate, Stated Percentage 6.625% 6.625%    
Senior Notes [Member] | 6.875% Senior Notes Due 2020 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 291 $ 291 304  
Long-term Debt, Gross $ 291 $ 291 304  
Debt Instrument, Interest Rate, Stated Percentage 6.875% 6.875%    
Senior Notes [Member] | 6.125% Senior Notes Due 2021 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 555 $ 555 589  
Long-term Debt, Gross $ 555 $ 555 589  
Debt Instrument, Interest Rate, Stated Percentage 6.125% 6.125%    
Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 272 $ 272 286  
Long-term Debt, Gross $ 272 $ 272 286  
Debt Instrument, Interest Rate, Stated Percentage 5.375% 5.375%    
Senior Notes [Member] | 4.875% Senior Notes due 2022 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 453 $ 453 639  
Long-term Debt, Gross $ 453 $ 453 639  
Debt Instrument, Interest Rate, Stated Percentage 4.875% 4.875%    
Senior Notes [Member] | 8.00% Senior Secured Second Lien Notes Due 2022 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 2,425 $ 2,425 2,425  
Long-term Debt, Gross $ 3,459 $ 3,459 3,584  
Debt Instrument, Interest Rate, Stated Percentage 8.00% 8.00%    
Senior Notes [Member] | 5.75% Senior Notes due 2023 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 339 $ 339 384  
Long-term Debt, Gross $ 339 $ 339 384  
Debt Instrument, Interest Rate, Stated Percentage 5.75% 5.75%    
Convertible Debt [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Unamortized Discount $ (28) $ (28) (133)  
Percentage Of Principal Amount Of Notes For Repurchase Requirement Of Contingent Convertible Senior Notes   100.00%    
Commitment Period   10 years    
Debt Instrument, Convertible, Terms of Conversion Feature   5 days    
Debt Instrument, Redemption Price, Percentage   100.00%    
Convertible Debt [Member] | Debt Instrument, Redemption, Period One [Member]        
Long-Term Debt Instrument [Line Items]        
Commitment Period   5 years    
Convertible Debt [Member] | Debt Instrument, Redemption, Period Two [Member]        
Long-Term Debt Instrument [Line Items]        
Commitment Period   10 years    
Convertible Debt [Member] | Debt Instrument, Redemption, Period Three [Member]        
Long-Term Debt Instrument [Line Items]        
Commitment Period   15 years    
Convertible Debt [Member] | Debt Instrument, Redemption, Period Four [Member]        
Long-Term Debt Instrument [Line Items]        
Commitment Period   20 years    
Convertible Debt [Member] | 6.5% Senior Notes Due 2017 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.50% 6.50%    
Convertible Debt [Member] | 2.75% Contingent Convertible Senior Notes Due 2035 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 2 $ 2 2  
Long-term Debt, Gross $ 2 $ 2 2  
Debt Instrument, Interest Rate, Stated Percentage 2.75% 2.75%    
Convertible Debt [Member] | 2.5% Contingent Convertible Senior Notes due 2037 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 130 $ 130 1,110  
Long-term Debt, Gross 125 125 1,027  
Debt Instrument, Unamortized Discount $ (5) $ (5)    
Debt Instrument, Interest Rate, Stated Percentage 2.50% 2.50%    
Debt Instrument, Redemption Period, Start Date   May 15, 2017    
Convertible Debt [Member] | 2.25% Contingent Convertible Senior Notes Due 2038 [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 207 $ 207 340  
Long-term Debt, Gross $ 184 $ 184 290  
Debt Instrument, Interest Rate, Stated Percentage 2.25% 2.25%    
Line of Credit [Member] | Revolving Credit Facility [Member]        
Long-Term Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 240 $ 240 0  
Long-term Line of Credit $ 240 $ 240 $ 0