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ATM Program (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Dec. 31, 2023
Debt Disclosure [Abstract] |  |
ATM Program Total Available Shares | $ 2,500.0 |
ATM Shares Issued | 0 | 3,120
ATM Net Proceeds |  | $ 188.0
ATM Shares Remaining | 2,300,000 |
ATM Transaction Fee |  | $ 2.0

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- References No definition available. + Details
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- Definition ATM Net Proceeds + References No definition available. + Details
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Namespace Prefix: | xel_
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- Definition ATM Program Total Available Shares + References No definition available. + Details
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- Definition ATM Shares Issued + References No definition available. + Details
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- Definition ATM Shares Remaining + References No definition available. + Details
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- Definition ATM Transaction Fee + References No definition available. + Details
Name: | xel_ATMTransactionFee
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration