Note 3 - Regulated Operations (Details) - Estimated Recognition of Rate Making Assets (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
Regulatory Assets [Line Items]
Rate Making Asset	$ 946	[1]	$ 819	[1]	$ 940	[1]
Regulatory Assett Off Balance Sheet [Member]
Regulatory Assets [Line Items]
Rate Making Asset	$ 102		$ 93		$ 71

[1] Amounts revised to include prior period adjustments. See Note 13 for additional information.