Note 12 - Discontinued Operations (Details) - Discontinued Operations from Statement of Income - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		$ 92		$ 181
Operating expenses
Cost of goods sold		57		111
Operation and maintenance		27		55
Depreciation and amortization				5
Taxes other than income taxes		3		4
Total operating expenses		91		198
Operating income (loss)		1		(17)
Income (loss) before income taxes		1		(17)
Income tax expense				(32)
Income (loss) from discontinued operations, net of tax		1		(49)
Tropical Shipping [Member]
Operating expenses
Loss on sale and goodwill impairment		$ 4		$ 23
Income tax expense	$ 29		$ 31