Recent Financing Transactions - NPC (Details) - NPC - NVE Holdings $ in Millions	Mar. 31, 2023 USD ($)
NPC Pollution Control Refunding Revenue Bonds, 1.875%, Series 2017A, due 2032
Debt Instrument [Line Items]
Repurchased amount	$ 40
Face amount	$ 40
Stated interest rate	4.125%
NPC Pollution Control Refunding Revenue Bonds, 1.65%, Series 2017B, due 2039
Debt Instrument [Line Items]
Repurchased amount	$ 13
Face amount	$ 13
Stated interest rate	3.75%
NPC Pollution Control Refunding Revenue Bonds, 1.65%, Series 2017, Due 2036
Debt Instrument [Line Items]
Repurchased amount	$ 40
Face amount	$ 40
Stated interest rate	3.75%