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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of Amounts Recognized in Balance Sheet
Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions):
 
As of
 
March 31,
 
December 31,
 
2014
 
2013
Qualified Pension Plan:
 
 
 
Other assets
$
17

 
$
18

 
 
 
 
Non-Qualified Pension Plans:
 
 
 
Customer deposits and other
(1
)
 
(1
)
Other long-term liabilities
(11
)
 
(11
)
 
 
 
 
Other Postretirement Plans:
 
 
 
Other long-term liabilities
(38
)
 
(38
)