Note 11 - Segment Information (Details) - Intersegment Reporting - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating revenues		$ 674	$ 889	$ 2,395	$ 3,351
Operating expenses
Cost of goods sold		222	402	1,157	1,802
Operation and maintenance		209	211	458	500
Depreciation and amortization		98	95	195	188
Taxes other than income taxes		38	42	114	130
Total operating expenses		567	750	1,924	2,620
Operating income (loss)		107	139	471	731
Other income (expense)		4	2	7	5
EBIT		111	141	478	736
Identifiable and total assets	[1]	13,835	13,902	13,835	13,902
Capital expenditures		264	171	452	332
Identifiable and total assets		13,835	14,159	13,835	14,159	$ 14,888
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues		674	889	2,395	3,351
Distribution Operations [Member]
Segment Reporting Information [Line Items]
Operating revenues		506	656	1,791	2,382
Operating expenses
Cost of goods sold		166	315	942	1,517
Operation and maintenance		160	159	345	370
Depreciation and amortization		83	78	165	156
Taxes other than income taxes		34	40	105	122
Total operating expenses		443	592	1,557	2,165
Operating income (loss)		103	107	330	335
Other income (expense)		3	3	4	4
EBIT		106	110	334	339
Identifiable and total assets	[1]	11,796	11,511	11,796	11,511
Capital expenditures		248	158	418	308
Identifiable and total assets						12,037
Distribution Operations [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues		40	43	96	118
Distribution Operations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues		546	699	1,887	2,500
Retail Operations [Member]
Segment Reporting Information [Line Items]
Operating revenues		153	176	494	582
Operating expenses
Cost of goods sold		95	119	305	399
Operation and maintenance		34	34	71	71
Depreciation and amortization		6	6	12	14
Taxes other than income taxes		1	1	2	2
Total operating expenses		136	160	390	486
Operating income (loss)		17	17	104	97
EBIT		17	17	104	97
Identifiable and total assets	[1]	636	671	636	671
Capital expenditures		2	3	4	6
Identifiable and total assets						670
Retail Operations [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues			1		1
Retail Operations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues		153	177	494	583
Wholesale Services [Member]
Segment Reporting Information [Line Items]
Operating revenues	[2]	$ 4	47	94	378
Operating expenses
Cost of goods sold	[2]		7	9	10
Operation and maintenance	[2]	$ 11	13	35	49
Depreciation and amortization	[2]	$ 1	$ 1	1	1
Taxes other than income taxes	[2]			1	1
Total operating expenses	[2]	$ 12	$ 21	46	61
Operating income (loss)	[2]	$ (8)	26	$ 48	317
Other income (expense)	[2]		(2)		(2)
EBIT	[2]	$ (8)	24	$ 48	315
Identifiable and total assets	[1],[2]	$ 806	$ 1,207	806	1,207
Capital expenditures	[2]			$ 1	$ 1
Identifiable and total assets						1,402
Wholesale Services [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues	[2]
Wholesale Services [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues	[2]	$ 4	$ 47	$ 94	$ 378
Midstream Operations [Member]
Segment Reporting Information [Line Items]
Operating revenues		11	17	30	61
Operating expenses
Cost of goods sold		2	11	12	47
Operation and maintenance		6	7	12	13
Depreciation and amortization		4	4	9	9
Taxes other than income taxes		1	2	2	3
Total operating expenses		13	24	35	72
Operating income (loss)		(2)	(7)	(5)	(11)
Other income (expense)				1	1
EBIT		(2)	(7)	(4)	(10)
Identifiable and total assets	[1]	686	699	686	699
Capital expenditures		7	5	10	5
Identifiable and total assets						694
Midstream Operations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues		11	17	30	61
Other Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues		3	1	9	4
Operating expenses
Cost of goods sold				5
Operation and maintenance				(2)	1
Depreciation and amortization		4	6	8	8
Taxes other than income taxes		2	(1)	4	2
Total operating expenses		6	5	15	11
Operating income (loss)		(3)	(4)	(6)	(7)
Other income (expense)		1	1	2	2
EBIT		(2)	(3)	(4)	(5)
Identifiable and total assets	[1]	9,190	9,482	9,190	9,482
Capital expenditures		7	5	19	12
Identifiable and total assets						9,706
Other Segments [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues		3	1	9	4
Intercompany Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues		(3)	(8)	(23)	(56)
Operating expenses
Cost of goods sold		(41)	(50)	(116)	(171)
Operation and maintenance		(2)	(2)	(3)	(4)
Total operating expenses		(43)	(52)	(119)	(175)
Identifiable and total assets	[1]	(9,279)	(9,668)	(9,279)	(9,668)
Identifiable and total assets						$ (9,621)
Intercompany Eliminations [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues		(40)	(44)	(96)	(119)
Intercompany Eliminations [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues		$ (43)	$ (52)	$ (119)	$ (175)

[1] Identifiable and total assets 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.