Note 11 - Segment Information (Details) - Operating Revenues (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,721		$ 2,462
Third Party Gross Costs	935		1,400
Operating Segments [Member] | Third Party Gross Revenues [Member] | Wholesale Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,146		4,049
Operating Segments [Member] | Intercompany Revenues [Member] | Wholesale Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	150		298
Operating Segments [Member] | Total Gross Revenues [Member] | Wholesale Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,296		4,347
Operating Segments [Member] | Third Party Gross Costs [Member] | Wholesale Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Third Party Gross Costs	2,206		4,016
Operating Segments [Member] | Wholesale Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	90	[1]	331	[1]
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,721		2,462
Wholesale Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	90	[1]	331	[1]
Third Party Gross Costs	$ 9	[1]	$ 3	[1]

[1] The revenues for wholesale services are netted with costs associated with its energy and risk management activities. A reconciliation of our operating revenues and our intercompany revenues is shown in the following table.