Recurring Fair Value Measurements (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023		Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]		Assets, Current		Assets, Current			Assets, Current
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Other Assets, Noncurrent		Other Assets, Noncurrent			Other Assets, Noncurrent
Derivative Liability, Noncurrent		$ 91		$ 91			$ 86
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Liabilities, Other than Long-Term Debt, Noncurrent		Liabilities, Other than Long-Term Debt, Noncurrent			Liabilities, Other than Long-Term Debt, Noncurrent
Reclaim Cash Collateral		$ 5		$ 5			$ 7
Changes in Level 3 Commodity Derivatives [Roll Forward]
Fair value hedges		0	$ 0	0	$ 0
Return Cash Collateral		0		0			0
Derivative Asset, Current		$ 234		$ 234			$ 104
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]		Liabilities, Current		Liabilities, Current			Liabilities, Current
Derivative Liability, Current		$ 44		$ 44			$ 74
Commodity Trading
Changes in Level 3 Commodity Derivatives [Roll Forward]
Balance at beginning of period		91	78	90	235
Purchases	[1]	174	167	177	172
Settlements	[1]	(110)	(47)	(161)	(76)
Gains (losses) recognized in earnings	[2]	3	10	3	(2)
Net gains recognized as regulatory assets and liabilities (a)	[1]	81	1	130	(120)
Balance at end of period		239	209	239	209
Other Derivative Instruments
Changes in Level 3 Commodity Derivatives [Roll Forward]
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)		(15)	11	(3)	104
Other Derivative Instruments | Electric Commodity
Changes in Level 3 Commodity Derivatives [Roll Forward]
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)	[3]	(15)	11	(3)	94
Other Derivative Instruments | Natural Gas Commodity
Changes in Level 3 Commodity Derivatives [Roll Forward]
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)				0	10	[4]
Other Derivative Instruments | Natural Gas Commodity | Electric fuel and purchased power
Changes in Level 3 Commodity Derivatives [Roll Forward]
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)				2
Designated as Hedging Instrument | Cash Flow Hedges
Changes in Level 3 Commodity Derivatives [Roll Forward]
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)		0	$ 0	0	$ 0
Fair Value Measured on a Recurring Basis
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		93		93			133
Netting	[5]	(56)		(56)			(67)
Derivative Liability, Noncurrent		72		72			64
Changes in Level 3 Commodity Derivatives [Roll Forward]
Derivative Asset, Current		232		232			101
Derivative Liability, Current		37		37			66
Fair Value Measured on a Recurring Basis | Level 1
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		6		6			6
Fair Value Measured on a Recurring Basis | Level 2
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		78		78			115
Fair Value Measured on a Recurring Basis | Level 3
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		9		9			12
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		89		89			97
Netting	[5]	(53)		(53)			(60)
Derivative Liability, Noncurrent		72		72			64
Changes in Level 3 Commodity Derivatives [Roll Forward]
Derivative Asset, Current		20		20			32
Derivative Liability, Current		36		36			37
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		3		3			7
Netting	[5]	(3)		(3)			(7)
Changes in Level 3 Commodity Derivatives [Roll Forward]
Derivative Asset, Current		208		208			55
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		1		1			12
Netting	[5]	0		0			0
Changes in Level 3 Commodity Derivatives [Roll Forward]
Derivative Asset, Current		4		4			14
Derivative Liability, Current		1		1			12
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		6		6			6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		0		0			0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		0		0			0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		77		77			86
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		0		0			0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		1		1			12
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		6		6			5
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		3		3			7
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Gross		0		0			0
Fair Value Measured on a Recurring Basis | Designated as Hedging Instrument | Interest Rate Swap
Changes in Level 3 Commodity Derivatives [Roll Forward]
Derivative Liability, Current							17
Fair Value, Measurements, Nonrecurring | PPAs
Derivatives, Fair Value [Line Items]
Derivative Liability, Noncurrent	[6]	19		19			22
Changes in Level 3 Commodity Derivatives [Roll Forward]
Derivative Asset, Current	[6]	2		2			3
Derivative Liability, Current	[6]	$ 7		$ 7			$ 8

[1] Relates primarily to NSP-Minnesota and SPS FTR instruments administered by MISO and SPP.

[2] Relates to commodity trading and is subject to substantial offsetting losses and gains on derivative instruments categorized as levels 1 and 2 in the income statement. See above tables for the income statement impact of derivative activity, including commodity trading gains and losses.

[3] Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.

[4] Other than $2 million of 2024 losses recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.

[5] Xcel Energy nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At June 30, 2024 and Dec. 31, 2023, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2024 and Dec. 31, 2023, derivative assets and liabilities include rights to reclaim cash collateral of $5 million and $7 million, respectively. Counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

[6] Xcel Energy currently applies the normal purchase exception to qualifying PPAs. Balance relates to specific contracts that were previously recognized at fair value prior to applying the normal purchase exception, and are being amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.