Subsidiary Debt - SPPC - Annual Payment on Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Three	$ 3,200
Long-term Debt, Maturities, Repayments of Principal after Year Five	37,637
Par value	49,759
Long-term Debt	49,866	$ 39,353
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Par value	1,167
Long-term Debt	1,164	$ 1,135
Sierra Pacific Power Company [Member] \| Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Three	250
Long-term Debt, Maturities, Repayments of Principal after Year Five	917
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(3)
Long-term Debt	1,164
NV Energy [Member]
Debt Instrument [Line Items]
Par value	3,701
NV Energy [Member] \| Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Par value	1,167
NV Energy [Member] \| Sierra Pacific Power Company [Member] \| Long-term Debt [Member]
Debt Instrument [Line Items]
Par value	$ 1,167

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Face (par) amount of debt instrument at time of issuance.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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