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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,330		$ 695
Proceeds from issuance of common stock	1,151	$ 1,109
ATM Net Proceeds	1,160		1,100
Letter of Credit
Short-term Debt [Line Items]
Amount outstanding at period end	$ 74		$ 42

X

- Definition

The cash inflow from the additional capital contribution to the entity.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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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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ATM Net Proceeds

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