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Note 4 - Debt (Details Textual) - USD ($)
Jul. 20, 2016
Sep. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Amended Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,000,000,000    
Long-term Line of Credit   0    
1.50% Due May 8, 2018 [Member] | Senior Notes [Member]        
Debt Instrument, Face Amount       $ 375,000,000
Debt Instrument, Interest Rate, Stated Percentage       1.50%
2.90% Due May 15, 2022 [Member] | Senior Notes [Member]        
Debt Instrument, Face Amount       $ 375,000,000
Debt Instrument, Interest Rate, Stated Percentage       2.90%
Debt Instrument, Fair Value Disclosure   4,300,000,000 $ 4,100,000,000  
Long-term Debt and Capital Lease Obligations   $ 3,916,000,000 $ 3,890,000,000  
Increase (Decrease) to Commercial Paper Maximum Capacity $ 1,000,000,000      
Commercial Paper, Maximum Borrowing Capacity $ 2,000,000,000