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Note 12 - Income Taxes (Details) - Income Tax Expense (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income taxes
Federal	$ 113us-gaap_CurrentFederalTaxExpenseBenefit	$ 164us-gaap_CurrentFederalTaxExpenseBenefit	$ 8us-gaap_CurrentFederalTaxExpenseBenefit
State	38	35	4
Deferred income taxes
Federal	184	(8)	128
State	17	(11)	20
Amortization of investment tax credits	(2)	(3)	(3)
Total	$ 350us-gaap_IncomeTaxExpenseBenefit	$ 177us-gaap_IncomeTaxExpenseBenefit	$ 157us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.