Retirement Plan and Postretirement Benefits Retirement Plan and Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2019

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 payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following as of December 31 (in millions):

	2019		2018
Qualified Pension Plan -
Other long-term liabilities	$	18	$	26
Non-Qualified Pension Plans:
Other current liabilities	1		1
Other long-term liabilities	9		9
Other Postretirement Plans -
Other long-term liabilities	2		1

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 Balance Sheets and consist of the following as of December 31(in millions):

	2019		2018
Qualified Pension Plan -
Other long-term liabilities	$	4	$	19
Non-Qualified Pension Plans:
Other current liabilities	1		1
Other long-term liabilities	8		7
Other Postretirement Plans -
Other long-term liabilities	7		13