Note 1 - Summary of Significant Accounting Policies (Details) - Supplemental Disclosure of Cash Flow Information - USD ($) $ in Millions		12 Months Ended
		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.