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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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-Publisher FASB
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Recent Financing Transactions Recent Financing Transactions - SPPC (Details) - NVE Holdings [Member] - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	Jun. 30, 2019	May 31, 2019	Apr. 30, 2019	Apr. 01, 2019
Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 30
Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 25
Debt Instrument, Interest Rate, Stated Percentage			2.05%
Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 25
Debt Instrument, Interest Rate, Stated Percentage				2.05%
Pollution Control Revenue Bonds, Variable-Rate, Series 2016B due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 30
Debt Instrument, Interest Rate, Stated Percentage			1.85%
Water facilities refunding revenue bonds, series 2016F, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 75
Debt Instrument, Interest Rate, Stated Percentage				2.05%
Water facilities refunding revenue bonds, series 2016G, due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 20
Debt Instrument, Interest Rate, Stated Percentage				1.85%
Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 59
Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 20
Secured credit facility, $250 million, expiring June 2022 [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250