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Note 3 - Debt (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Note 3 - Debt (Details) [Line Items]      
Debt Instrument, Fair Value Disclosure   $ 4,200 $ 3,600
Long-term Debt and Capital Lease Obligations   3,915 $ 3,227
Proceeds from Issuance of Unsecured Debt   745  
Senior Notes [Member]      
Note 3 - Debt (Details) [Line Items]      
Proceeds from Issuance of Unsecured Debt $ 745    
Amended Credit Facility [Member]      
Note 3 - Debt (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   2,000  
Long-term Line of Credit   $ 0  
1.50% Due May 8, 2018 [Member] | Senior Notes [Member]      
Note 3 - Debt (Details) [Line Items]      
Debt Instrument, Face Amount $ 375    
Debt Instrument, Interest Rate, Stated Percentage 1.50%    
2.90% Due May 15, 2022 [Member] | Senior Notes [Member]      
Note 3 - Debt (Details) [Line Items]      
Debt Instrument, Face Amount $ 375    
Debt Instrument, Interest Rate, Stated Percentage 2.90%