SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES PROPERTY, PLANT, AND EQUIPMENT (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, plant and equipment
Gain (loss) on retirement of utility property, excluding land	$ 0
Software | Minimum
Property, plant and equipment
Useful life	3 years
Software | Maximum
Property, plant and equipment
Useful life	5 years
Electric
Property, plant and equipment
Annual utility composite depreciation rate (as a percent)	2.79%	2.87%	2.88%
Natural gas
Property, plant and equipment
Annual utility composite depreciation rate (as a percent)	2.19%	2.21%	2.22%