Note 3 - Regulated Operations (Details) - Change in Net Position of Deferred and Accrued Natural Gas Costs (USD $) In Millions, unless otherwise specified	6 Months Ended						12 Months Ended						12 Months Ended				12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013		Jun. 30, 2014 Accrued natural gas costs [Member]		Dec. 31, 2013 Accrued natural gas costs [Member]		Jun. 30, 2013 Accrued natural gas costs [Member]		Jun. 30, 2014 Natural Gas Costs [Member]		Jun. 30, 2013 Natural Gas Costs [Member]		Jun. 30, 2014 Deferred Natural Gas Costs [Member]		Dec. 31, 2013 Deferred Natural Gas Costs [Member]		Jun. 30, 2013 Deferred Natural Gas Costs [Member]
Note 3 - Regulated Operations (Details) - Change in Net Position of Deferred and Accrued Natural Gas Costs [Line Items]
Deferred natural gas costs	$ 165	[1]	$ 74	[1]	$ 114	[1]											$ 79	[1]	$ 1	[1]		[1]
Deferred natural gas costs	129		(40)														79
Accrued natural gas costs	(149)	[1]	(216)	[1]	(183)	[1]	(41)	[1]	(92)	[1]	(130)	[1]
Accrued natural gas costs							89
Total (1)													38	[2]	(130)	[2]
Total (1)													$ 168	[2]

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

[2] The $168 million change resulted from increased natural gas prices during the first half of 2014 compared to the first half of 2013, primarily driven by colderweather experienced in 2014. These costs will be fully recovered in future periods.