Recent Financing Transactions - SPPC (Details) - SPPC $ in Millions	Feb. 29, 2024 USD ($)
Washoe County Series 2016F, due 2036
Debt Instrument [Line Items]
Stated interest rate	4.125%
Washoe County Series 2016F, due 2036 | Subsidiary Debt
Debt Instrument [Line Items]
Face amount	$ 75
Washoe County Series 2016B, due 2036
Debt Instrument [Line Items]
Stated interest rate	3.625%
Washoe County Series 2016B, due 2036 | Subsidiary Debt
Debt Instrument [Line Items]
Face amount	$ 60
Humboldt County Series 2016B, due 2029 | Subsidiary Debt
Debt Instrument [Line Items]
Face amount	$ 30
Stated interest rate	3.55%
Washoe County Series 2016C, due 2036
Debt Instrument [Line Items]
Stated interest rate	4.125%
Washoe County Series 2016C, due 2036 | Subsidiary Debt
Debt Instrument [Line Items]
Face amount	$ 30
Humboldt County Series 2016A due 2029 | Subsidiary Debt
Debt Instrument [Line Items]
Face amount	$ 20
Stated interest rate	3.55%
Washoe County Series 2016G, due 2036
Debt Instrument [Line Items]
Stated interest rate	3.625%
Washoe County Series 2016G, due 2036 | Subsidiary Debt
Debt Instrument [Line Items]
Face amount	$ 20