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Note 1 - Summary of Significant Accounting Policies (Details) - Supplemental Disclosure of Cash Flow Information - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Non-cash transactions: |  |  |  |
Accruals for capital expenditures |  | $ 298 | $ 358 | $ 185
Cash paid for interest and income taxes: |  |  |  |
Interest (1) | [1] | 178 | 171 | 182
Income taxes, net of refunds received |  | $ 253 | $ 577 | $ 469
[1] | Included in this amount are approximately $35 million, $40 million and $35 million of interest costs that were capitalized as part of property, plant and equipment, net of accumulated depreciation, in 2015, 2014 and 2013, respectively.

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