Borrowings and Other Financing Instruments (Details) - Bonds [Member] $ in Millions	Sep. 30, 2023 USD ($)
Series Due May 15, 2053
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 800
Series Due May 15, 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.10%

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.

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+ Details