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Retirement Plan and Postretirement Benefits Retirement Plan and Postretirement Benefits (Tables)
12 Months Ended
Dec. 31, 2016
Nevada Power Company [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following as of December 31 (in millions):
 
2016
 
2015
Qualified Pension Plan -
 
 
 
Other long-term liabilities
$
(24
)
 
$
(38
)
 
 
 
 
Non-Qualified Pension Plans:
 
 
 
Other current liabilities
(1
)
 
(1
)
Other long-term liabilities
(9
)
 
(9
)
 
 
 
 
Other Postretirement Plans -
 
 
 
Other long-term liabilities
(4
)
 
(5
)
Sierra Pacific Power Company [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Amounts payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following as of December 31(in millions):
 
2016
 
2015
Qualified Pension Plan -
 
 
 
Other long-term liabilities
$
(12
)
 
$
(29
)
 
 
 
 
Non-Qualified Pension Plans:
 
 
 
Other current liabilities
(1
)
 
(1
)
Other long-term liabilities
(9
)
 
(9
)
 
 
 
 
Other Postretirement Plans -
 
 
 
Other long-term liabilities
(28
)
 
(32
)
Domestic Pension Plans [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions):
 
Pension
 
Other Postretirement
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
29

 
$
33

 
$
36

 
$
9

 
$
11

 
$
14

Interest cost
126

 
121

 
131

 
31

 
31

 
46

Expected return on plan assets
(160
)
 
(169
)
 
(164
)
 
(41
)
 
(45
)
 
(53
)
Net amortization
46

 
53

 
44

 
(12
)
 
(11
)
 
(3
)
Net periodic benefit cost (credit)
$
41

 
$
38

 
$
47

 
$
(13
)
 
$
(14
)
 
$
4