Note 3 - Regulated Operations (Details) - Estimated Recognition of Rate Making Assets (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013
Regulatory Assets [Line Items]
Rate Making Asset	$ 891	[1]	$ 819	[1]	$ 954	[1]
Regulatory Assett Of fBalance Sheet [Member]
Regulatory Assets [Line Items]
Rate Making Asset	$ 109		$ 93		$ 79

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