Recent Financing Transactions - PAC (Details) - PAC - Subsidiary Debt $ in Millions	Jan. 31, 2024 USD ($)
Debt Instrument [Line Items]
Face amount	$ 3,800
First Mortgage Bonds, 5.10%, due 2029
Debt Instrument [Line Items]
Face amount	$ 500
Stated interest rate	5.10%
First Mortgage Bonds, 5.30%, due 2031
Debt Instrument [Line Items]
Face amount	$ 700
Stated interest rate	5.30%
First Mortgage Bonds, 5.45%, due 2034
Debt Instrument [Line Items]
Face amount	$ 1,100
Stated interest rate	5.45%
First Mortgage Bonds, 5.80%, due 2055
Debt Instrument [Line Items]
Face amount	$ 1,500
Stated interest rate	5.80%