Note 6 - Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Note 6 - Employee Benefit Plans (Details) [Line Items]
Expected Savings Percentage of Medicare Liability	12.00%
Regulatory Assets	$ 819,000,000	[1]	$ 1,037,000,000	[1]
Defined Contribution Plan, Employer Matching Contribution	14,000,000		12,000,000		7,000,000
Defined Benefit Welfare Benefits [Member] | Other Postretirement Benefit Plan [Member]
Note 6 - Employee Benefit Plans (Details) [Line Items]
Regulatory Assets	108,000,000		215,000,000
Supplemental Employee Retirement Plan [Member]
Note 6 - Employee Benefit Plans (Details) [Line Items]
Defined Benefit Plan, Benefit Obligation	2,000,000		3,000,000
Pension Plan [Member]
Note 6 - Employee Benefit Plans (Details) [Line Items]
Defined Benefit Plan, Contributions by Employer			$ 40,000,000

[1] Amounts revised to include prior period adjustments. See Note 15 for additional information.