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Credit Related Contingent Features (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Fair Value Disclosures [Abstract] |  |
Derivative, Gross Liability Position, Aggregate Fair Value | $ 10 | $ 4
Derivative, Gross Liability with Cross Default Position, Aggregate Fair Value | $ 77 | $ 76

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a gross liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Derivative, Gross Liability with Cross Default Position, Aggregate Fair Value + References No definition available. + Details
Name: | xel_DerivativeGrossLiabilityWithCrossDefaultPositionAggregateFairValue
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant