Note 3 - Regulated Operations (Details) - Costs Related to Remediation of Former Operating Sites (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Environmental Exit Cost [Line Items]
Probabilistic model cost estimates, low estimate	$ 397
Probabilistic model cost estimates, high estimate	764
Engineering estimates	69
Amount recorded	469	[1]
Expected costs over next 12 months	90	[1]
Illinois Environmental [Member]
Environmental Exit Cost [Line Items]
Probabilistic model cost estimates, low estimate	205
Probabilistic model cost estimates, high estimate	462
Engineering estimates	46
Amount recorded	251
Expected costs over next 12 months	37
New Jersey Environmental [Member]
Environmental Exit Cost [Line Items]
Probabilistic model cost estimates, low estimate	126
Probabilistic model cost estimates, high estimate	196
Engineering estimates	3
Amount recorded	129
Expected costs over next 12 months	32
Georgia And Florida [Member]
Environmental Exit Cost [Line Items]
Probabilistic model cost estimates, low estimate	66
Probabilistic model cost estimates, high estimate	106
Engineering estimates	9
Amount recorded	78
Expected costs over next 12 months	14
North Carolina Environmental [Member]
Environmental Exit Cost [Line Items]
Probabilistic model cost estimates, low estimate		[2]
Probabilistic model cost estimates, high estimate		[2]
Engineering estimates	11	[2]
Amount recorded	11	[2]
Expected costs over next 12 months	$ 7	[2]

[1] Increase of $22 million from December 31, 2013 primarily relates to a scope increase required by the Georgia Environmental Protection Division for a site in Georgia and an adjustment for a site in Florida. This was partially offset by a decrease for a site in New Jersey where remediation is almost complete.

[2] We have no regulatory recovery mechanisms for the site in North Carolina. Therefore, this amount is not included in our regulatory assets and changes in estimated costs are recognized in income in the period of change.