Interest Rate Derivatives (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Other Current Assets
Derivative [Line Items]
Derivative Asset, Net		$ 125	$ 123
Other Current Assets | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		352	255
Netting	[1]	232	135
Derivative Asset, Net		120	120
Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		56	22
Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		194	155
Other Current Assets | Level 3 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		102	78
Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Net		94	67
Other Noncurrent Assets | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		224	168
Netting	[1]	135	107
Derivative Asset, Net		89	61
Other Noncurrent Assets | Level 1 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		36	16
Other Noncurrent Assets | Level 2 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		66	63
Other Noncurrent Assets | Level 3 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		122	89
Interest rate derivatives
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		5
Derivative Liability, Notional Amount		245
Commodity Trading | Other Current Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		308	180
Netting	[1]	231	134
Derivative Asset, Net		77	46
Commodity Trading | Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		56	22
Commodity Trading | Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		188	137
Commodity Trading | Other Current Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		64	21
Commodity Trading | Other Noncurrent Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		219	168
Netting	[1]	135	107
Derivative Asset, Net		84	61
Commodity Trading | Other Noncurrent Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		36	16
Commodity Trading | Other Noncurrent Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		66	63
Commodity Trading | Other Noncurrent Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		117	89
Electric Commodity | Other Current Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		38	57
Netting	[1]	1	1
Derivative Asset, Net		37	56
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		38	57
Electric Commodity | Other Noncurrent Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		5	0
Netting		0	0
Derivative Asset, Net		5	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		5	0
Interest Rate | Other Current Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		6	0
Netting		0	0
Derivative Asset, Net		6	0
Interest Rate | Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		0	0
Interest Rate | Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		6	0
Interest Rate | 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, and all derivative instruments and related collateral amounts were subject to master netting agreements at March 31, 2022 and Dec. 31, 2021. At both March 31, 2022 and Dec. 31, 2021, derivative assets and liabilities include no obligations to return cash collateral. At March 31, 2022 and Dec. 31, 2021, derivative assets and liabilities include rights to reclaim cash collateral of $34 million and $30 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.