Interest Rate Derivatives (Details) - USD ($) $ in Millions		Jun. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative Asset, Current		$ 234	$ 104
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]		Assets, Current	Assets, Current
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Other Assets, Noncurrent	Other Assets, Noncurrent
Derivative Liability, Noncurrent		$ 91	$ 86
Derivative Liability, Current		44	74
Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Current		232	101
Derivative Asset, Noncurrent		84	76
Derivative Liability, Gross		93	133
Netting	[1]	(56)	(67)
Derivative Liability, Noncurrent		72	64
Derivative Liability, Current		37	66
Fair Value, Measured on a Recurring Basis | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		286	167
Netting	[1]	54	66
Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Gross		120	110
Netting	[1]	36	34
Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Gross		112	103
Netting	[1]	(40)	(39)
Level 1 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Liability, Gross		6	6
Level 1 | Fair Value, Measured on a Recurring Basis | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		6	8
Level 1 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Gross		11	14
Level 1 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Gross		14	16
Level 2 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Liability, Gross		78	115
Level 2 | Fair Value, Measured on a Recurring Basis | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		47	65
Level 2 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Gross		52	51
Level 2 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Gross		56	50
Level 3 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Liability, Gross		9	12
Level 3 | Fair Value, Measured on a Recurring Basis | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		233	94
Level 3 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Gross		57	45
Level 3 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Gross		42	37
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Current		20	32
Derivative Asset, Noncurrent		84	76
Derivative Liability, Gross		89	97
Netting	[1]	(53)	(60)
Derivative Liability, Noncurrent		72	64
Derivative Liability, Current		36	37
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		71	91
Netting	[1]	51	59
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Gross		120	110
Netting	[1]	36	34
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Gross		112	103
Netting	[1]	(40)	(39)
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		6	6
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		6	8
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Gross		11	14
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Gross		14	16
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		77	86
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		43	51
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Gross		52	51
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Gross		56	50
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		6	5
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		22	32
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Gross		57	45
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability, Gross		42	37
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Current		208	55
Derivative Liability, Gross		3	7
Netting	[1]	(3)	(7)
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		211	62
Netting	[1]	3	7
Electric Commodity | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		0	0
Electric Commodity | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		0	0
Electric Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		0	0
Electric Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		0	0
Electric Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		3	7
Electric Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		211	62
Interest Rate Swap
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		1
Derivative Liability, Notional Amount		0
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Current			17
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities
Derivative [Line Items]
Netting	[1]	0	0
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities | Cash Flow Hedges
Derivative [Line Items]
Derivative Liability, Gross		0	17
Interest Rate Swap | Level 1 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities | Cash Flow Hedges
Derivative [Line Items]
Derivative Liability, Gross		0	0
Interest Rate Swap | Level 2 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities | Cash Flow Hedges
Derivative [Line Items]
Derivative Liability, Gross		0	17
Interest Rate Swap | Level 3 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities | Cash Flow Hedges
Derivative [Line Items]
Derivative Liability, Gross		0	0
PPAs | Fair Value, Measurements, Nonrecurring
Derivative [Line Items]
Derivative Asset, Current	[2]	2	3
Derivative Liability, Noncurrent	[2]	19	22
Derivative Liability, Current	[2]	7	8
Natural Gas Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Current		4	14
Derivative Liability, Gross		1	12
Netting	[1]	0	0
Derivative Liability, Current		1	12
Natural Gas Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		4	14
Netting	[1]	0	0
Natural Gas Commodity | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		0	0
Natural Gas Commodity | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		0	0
Natural Gas Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		1	12
Natural Gas Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		4	14
Natural Gas Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Liability, Gross		0	0
Natural Gas Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets
Derivative [Line Items]
Derivative Asset, Gross		$ 0	$ 0

[1] 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.

[2] 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.