Interest Rate Derivatives (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative Asset, Current		$ 86	$ 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
Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Current		$ 84	$ 101
Derivative Asset, Noncurrent		90	76
Other Current Assets | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		138	167
Netting	[1]	54	66
Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		9	8
Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		45	65
Other Current Assets | Level 3 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		84	94
Other Noncurrent Assets | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		124	110
Netting	[1]	34	34
Other Noncurrent Assets | Level 1 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		12	14
Other Noncurrent Assets | Level 2 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		54	51
Other Noncurrent Assets | Level 3 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		58	45
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Current		34	32
Derivative Asset, Noncurrent		83	76
Commodity Trading | Other Current Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		84	91
Netting	[1]	50	59
Commodity Trading | Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		9	8
Commodity Trading | Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		45	51
Commodity Trading | Other Current Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		30	32
Commodity Trading | Other Noncurrent Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		117	110
Netting	[1]	34	34
Commodity Trading | Other Noncurrent Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		12	14
Commodity Trading | Other Noncurrent Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		54	51
Commodity Trading | Other Noncurrent Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		51	45
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Current		50	55
Derivative Asset, Noncurrent		7	0
Electric Commodity | Other Current Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		54	62
Netting	[1]	4	7
Electric Commodity | Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		0	0
Electric Commodity | Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		0	0
Electric Commodity | Other Current Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		54	62
Electric Commodity | Other Noncurrent Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		7	0
Netting		0	0
Electric Commodity | Other Noncurrent Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		0	0
Electric Commodity | Other Noncurrent Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		0	0
Electric Commodity | Other Noncurrent Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		7	0
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
PPAs | Fair Value, Measurements, Nonrecurring
Derivative [Line Items]
Derivative Asset, Current	[2]	2	3
Natural Gas Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Current			14
Natural Gas Commodity | Other Current Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		0	14
Netting	[1]	0	0
Natural Gas Commodity | Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		0	0
Natural Gas Commodity | Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		0	14
Natural Gas Commodity | Other Current Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
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 March 31, 2024 and Dec. 31, 2023, derivative assets and liabilities include no obligations to return cash collateral. At March 31, 2024 and Dec. 31, 2023, derivative assets and liabilities include rights to reclaim cash collateral of $8 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.