Interest Rate Derivatives (Details) - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Other Current Assets
Derivative [Line Items]
Derivative Asset, Net		$ 534	$ 123
Other Current Assets | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		787	255
Netting	[1]	258	135
Derivative Asset, Net		529	120
Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		57	22
Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		242	155
Other Current Assets | Level 3 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		488	78
Other Noncurrent Assets
Derivative [Line Items]
Derivative Asset, Net		105	67
Other Noncurrent Assets | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		263	168
Netting	[1]	163	107
Derivative Asset, Net		100	61
Other Noncurrent Assets | Level 1 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		48	16
Other Noncurrent Assets | Level 2 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		121	63
Other Noncurrent Assets | Level 3 | Fair Value, Measured on a Recurring Basis
Derivative [Line Items]
Derivative Asset, Gross		94	89
Interest rate derivatives
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		4
Derivative Liability, Notional Amount		0
Commodity Trading | Other Current Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		350	180
Netting	[1]	255	134
Derivative Asset, Net		95	46
Commodity Trading | Other Current Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		57	22
Commodity Trading | Other Current Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		233	137
Commodity Trading | Other Current Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		60	21
Commodity Trading | Other Noncurrent Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		263	168
Netting	[1]	163	107
Derivative Asset, Net		100	61
Commodity Trading | Other Noncurrent Assets | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		48	16
Commodity Trading | Other Noncurrent Assets | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		121	63
Commodity Trading | Other Noncurrent Assets | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		94	89
Electric Commodity | Other Current Assets | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments
Derivative [Line Items]
Derivative Asset, Gross		428	57
Netting	[1]	3	1
Derivative Asset, Net		425	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		$ 428	$ 57

[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 June 30, 2022 and Dec. 31, 2021. At both June 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2022 and Dec. 31, 2021, derivative assets and liabilities include rights to reclaim cash collateral of $2 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.(b)Amounts relate to FTR instruments administered by MISO and SPP (annual auctions occurring in the second quarter). These instruments are utilized/intended to offset the impacts of transmission system congestion. Higher congestion costs have led to an increase in the fair value of FTRs. Due to regulatory recovery, changes in fair value are deferred as a regulatory asset or liability and do not have a material impact on net income.