Benefit Plans and Other Postretirement Benefits (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
		Jan. 31, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost			$ 18	$ 25	$ 37	$ 49
Interest Cost	[1]		40	28	80	55
Expected Return on Plan Assets	[1]		(52)	(52)	(105)	(104)
Amortization of Prior Service Credit	[1]		0	(1)	(1)	(1)
Amortization of Net Loss	[1]		5	18	11	37
Net periodic benefit cost (credit)			11	18	22	35
Effects of regulation			7	1	14	6
Net benefit cost (credit) recognized for financial reporting			18	19	36	41
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	[2]				0	(1)
Settlement Charge True-Ups					1
Pension Plan [Member] | Parent Company
Components of Net Periodic Benefit Cost [Abstract]
Contributions to Xcel Energy's pension plans		$ 50
Other Postretirement Benefits Plan [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost			0	1	0	1
Interest Cost	[1]		5	4	11	8
Expected Return on Plan Assets	[1]		(4)	(5)	(9)	(9)
Amortization of Prior Service Credit	[1]		0	(1)	0	(3)
Amortization of Net Loss	[1]		1	0	1	1
Net periodic benefit cost (credit)			2	(1)	3	(2)
Effects of regulation			0	0	0	1
Net benefit cost (credit) recognized for financial reporting			$ 2	$ (1)	3	(1)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	[2]				$ 0	$ 0

[1] The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset

[2] In the six months ended June 30, 2022, Xcel Energy recognized $1 million in settlement charge true-ups related to the fourth quarter of 2021.