Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014 sqmi retail_customers	Jun. 30, 2013	Jun. 30, 2014 sqmi retail_customers	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2013
Basis of Presentation [Abstract]
Service Area Sq Miles	4,000		4,000
Incorporated Cities	52		52
Number of Retail Customers	841,930		841,930
Service Area Population	1.7		1.7
Percent of State's Population	44.00%		44.00%
Margin Deposit Assets	$ 2		$ 2						$ 9
Cash received to be returned to customers pursuant to the Residential Exchange Program			14	1
Power Cost Deferrals, Net				3
Other Comprehensive Income	0	0	0	0
Revenue overstatement		$ 9			$ 3	$ 3	$ 2	$ 1