Borrowings and Other Financing Instruments - Borrowings and Other Financing Instruments, Long-Term Borrowings and Other Financing Instruments (Details) - Bonds [Member] $ in Millions	Sep. 30, 2026 USD ($)
Series Due March 13, 2029
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 700
Debt Instrument, Interest Rate, Stated Percentage	4.15%
Series Due June 15, 2036
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 600
Debt Instrument, Interest Rate, Stated Percentage	5.05%
Series Due May 15, 2034
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 150
Debt Instrument, Interest Rate, Stated Percentage	5.35%
Series Due August, 15, 2056
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 650
Debt Instrument, Interest Rate, Stated Percentage	6.20%

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