Note 6 - Income Taxes (Details) - Deferred Tax Assets for Loss and Tax Credit Carryforwards (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Tax Credit Carryforward [Line Items]
Net operating losses	$ 423
Capital losses	9
Tax credits	803
Totals as of December 31, 2014	1,235	1,788
2015-2019 [Member]
Tax Credit Carryforward [Line Items]
Net operating losses	92
Capital losses	9
Tax credits	62
Totals as of December 31, 2014	163
2020-2024 [Member]
Tax Credit Carryforward [Line Items]
Net operating losses	120
Tax credits	672
Totals as of December 31, 2014	792
2025-2034 [Member]
Tax Credit Carryforward [Line Items]
Net operating losses	20
Tax credits	38
Totals as of December 31, 2014	58
Indefinite [Member]
Tax Credit Carryforward [Line Items]
Net operating losses	191
Tax credits	31
Totals as of December 31, 2014	$ 222