Subsidiary Debt Subsidiary Debt - NPC - 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 Next Twelve Months	$ 2,539
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
Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value	2,384
Long-term Debt	2,351	$ 2,353
Nevada Power Company [Member] \| Subsidiary Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	575
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,809
Debt Instrument, Unamortized Premium, Discount and Debt Issuance Cost	33
Long-term Debt	2,351
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 Next Twelve Months	890
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,696
Par value	3,836
NV Energy [Member] \| Nevada Power Company [Member]
Debt Instrument [Line Items]
Par value	2,384
NV Energy [Member] \| Nevada Power Company [Member] \| Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	$ 2,384

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

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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 next 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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