Note 11 - Segment Information (Details) - Segment Reporting (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014	Mar. 31, 2014
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets	$ 14,138		$ 14,909	$ 15,264
Distribution Operations [Member] | Continuing Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets	11,899	[1]		11,823	[1]
Distribution Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets			12,041
Retail Operations [Member] | Continuing Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets	1,100	[1]		738	[1]
Retail Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets			670
Wholesale Services [Member] | Continuing Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets	698	[1],[2]		1,782	[1],[2]
Wholesale Services [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets			1,402
Midstream Operations [Member] | Continuing Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets	693	[1]		698	[1]
Midstream Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets			694
Other Segments [Member] | Continuing Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets	9,052	[1],[3]		9,844	[1],[3]
Other Segments [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets			9,723
Intersegment Eliminations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets			(9,621)
Continuing Operations [Member]
Note 11 - Segment Information (Details) - Segment Reporting [Line Items]
Assets	$ 14,138	[1]	$ 14,909	$ 15,000	[1]

[1] Identifiable assets are those used in each segment's operations. Amounts as of March 31, 2014 exclude assets held for sale.

[2] 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.

[3] Our other non-reportable segments include our investment in Triton, which was part of our cargo shipping segment that is classified as discontinued operations. For more information, see Note 12.