Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfOtherLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Recent Financing Transactions - SPPC (Details) - USD ($) $ in Millions	1 Months Ended			6 Months Ended
	Jun. 30, 2022	May 31, 2022	Apr. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Repayments of subsidiary debt				$ 542	$ 1,210
Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 \| SPPC \| Subsidiary Debt
Debt Instrument [Line Items]
Repayments of subsidiary debt	$ 60
Mortgage securities, 4.71%, series W due 2052 \| SPPC \| Subsidiary Debt
Debt Instrument [Line Items]
Face amount		$ 250
Stated interest rate		4.71%
NV Energy loan, payable upon demand \| SPPC \| Unsecured Debt
Debt Instrument [Line Items]
Repayments of subsidiary debt		$ 200
Face amount			$ 200
NV Energy loan, payable upon demand \| SPPC \| Unsecured Debt \| London Interbank Offered Rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.75%
Water facilities refunding revenue bonds, series 2016C, due 2036 \| SPPC \| Subsidiary Debt
Debt Instrument [Line Items]
Repayments of subsidiary debt			$ 30
Water facilities refunding revenue bonds, series 2016D, due 2036 \| SPPC \| Subsidiary Debt
Debt Instrument [Line Items]
Repayments of subsidiary debt			25
Water facilities refunding revenue bonds, series 2016E, due 2036 \| SPPC \| Subsidiary Debt
Debt Instrument [Line Items]
Repayments of subsidiary debt			25
Water facilities refunding revenue bonds, series 2016F, due 2036 \| SPPC \| Subsidiary Debt
Debt Instrument [Line Items]
Repayments of subsidiary debt			75
Water facilities refunding revenue bonds, series 2016G, due 2036 \| SPPC \| Subsidiary Debt
Debt Instrument [Line Items]
Repayments of subsidiary debt			20
Pollution control refunding revenue bonds, 1.850%, Series 2016B, due 2029 \| SPPC \| Subsidiary Debt
Debt Instrument [Line Items]
Repayments of subsidiary debt			$ 30
Secured credit facility, $250 million, expiring June 2024 \| SPPC \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250			$ 250