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Note 12 - Debt (Details)
¥ in Billions
3 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Mar. 31, 2013
CNY (¥)
Note 12 - Debt (Details) [Line Items]                  
Debt, Weighted Average Interest Rate         7.00%   2.50%    
Debt Instrument, Fair Value Disclosure         $ 4,100,000,000   $ 3,600,000,000    
Proceeds from Issuance of Unsecured Debt         745,000,000 $ 248,000,000      
Capital Lease Obligations Incurred   $ 230,000,000              
Senior Notes [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Proceeds from Issuance of Unsecured Debt $ 745,000,000                
Amended Credit Facility [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity       $ 1,000,000,000       $ 2,000,000,000  
Long-term Line of Credit         $ 0        
Foreign Line of Credit [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity | ¥                 ¥ 4
Repayments of Lines of Credit       $ 500,000,000          
Commercial Paper [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity     $ 1,000,000,000            
Commercial Paper [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Debt, Weighted Average Interest Rate         0.60%        
Debentures 1.5%, Due 2018 [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage         1.50%        
Debentures 1.5%, Due 2018 [Member] | Senior Notes [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Debt Instrument, Face Amount $ 375,000,000                
Debt Instrument, Interest Rate, Stated Percentage 1.50%                
Debentures 2.9%, Due 2022 [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage         2.90%        
Debentures 2.9%, Due 2022 [Member] | Senior Notes [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Debt Instrument, Face Amount $ 375,000,000                
Debt Instrument, Interest Rate, Stated Percentage 2.90%                
Debentures, 3.70%, due 2023 [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage         3.70%   3.70%    
Debentures, 3.70%, due 2023 [Member] | Senior Notes [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Debt Instrument, Face Amount   $ 250,000,000       $ 250,000,000      
Debt Instrument, Interest Rate, Stated Percentage   3.70%       3.70%      
Proceeds from Issuance of Long-term Debt and Capital Securities, Net   $ 248,000,000              
Maximum [Member] | Commercial Paper [Member]                  
Note 12 - Debt (Details) [Line Items]                  
Debt Instrument, Term     390 days