Note 2 - Significant Accounting Policies and Methods of Application (Details) - Changes in Amount of Goodwill (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill - December 31, 2014 and 2013	$ 1,827	$ 1,827
Distribution Operations [Member]
Goodwill [Line Items]
Goodwill - December 31, 2014 and 2013	1,640	1,640
Retail Operations [Member]
Goodwill [Line Items]
Goodwill - December 31, 2014 and 2013	173	173
Midstream Operations [Member]
Goodwill [Line Items]
Goodwill - December 31, 2014 and 2013	$ 14	$ 14