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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,079		$ 813
Proceeds from issuance of common stock	6	$ 1
Letter of Credit
Short-term Debt [Line Items]
Amount outstanding at period end	$ 43		$ 43

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- Definition

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

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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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