Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Straight-Line Depreciation Rates

Provisions at composite straight-line depreciation rates approximate the following percentages for the cost of depreciable property:

	2013	2012	2011
Electric	2.7%	2.9%	3.2%
Gas	1.7%	1.7%	1.6%
Nonregulated	2.3%	2.3%	2.3%