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Note 3 - Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Note 3 - Debt (Details) [Line Items] |  |  |
Debt Instrument, Fair Value Disclosure | $ 4,200 | $ 4,200 | $ 3,600
Long-term Debt and Capital Lease Obligations | 3,910 | 3,910 | $ 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 |  |
1.50% Due May 8, 2018 [Member] | Senior Notes [Member] |  |  |
Note 3 - Debt (Details) [Line Items] |  |  |
Debt Instrument, Face Amount | $ 375 | $ 375 |
Debt Instrument, Interest Rate, Stated Percentage | 1.50% | 1.50% |
2.90% Due May 15, 2022 [Member] | Senior Notes [Member] |  |  |
Note 3 - Debt (Details) [Line Items] |  |  |
Debt Instrument, Face Amount | $ 375 | $ 375 |
Debt Instrument, Interest Rate, Stated Percentage | 2.90% | 2.90% |

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