Subsidiary Debt Subsidiary Debt - SPPC - Annual Payment on Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Four	$ 2,508
Long-term Debt, Maturities, Repayments of Principal after Year Five	29,872
Par value	39,634
Long-term Debt	39,353	$ 36,774
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	30,883
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Long-term Debt	1,135	$ 1,120
Sierra Pacific Power Company [Member] \| Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Four	250
Long-term Debt, Maturities, Repayments of Principal after Year Five	887
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	(2)
Long-term Debt	1,135
NV Energy [Member]
Debt Instrument [Line Items]
Par value	3,836
NV Energy [Member] \| Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Four	250
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,696
Par value	3,836
NV Energy [Member] \| Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Par value	1,137
NV Energy [Member] \| Sierra Pacific Power Company [Member] \| Long-term Debt [Member]
Debt Instrument [Line Items]
Par value	$ 1,137

Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost

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- Definition

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

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+ References

No definition available.

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- Definition

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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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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