Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income
Income (Loss) from Equity Method Investments		$ 19	$ 35	$ 36
Expenses and other deductions
Other income		(143)	(22)	13
Interest charges and financing costs		1,255	1,055	953
Income before income taxes		1,534	1,625	1,601
Income tax benefit		(402)	(146)	(135)
Net income		1,936	1,771	1,736
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total comprehensive income		$ 1,962	$ 1,770	$ 1,766
Weighted average common shares outstanding:
Basic		563	552	547
Diluted	[1]	563	552	547
Earnings per average common share:
Basic		$ 3.44	$ 3.21	$ 3.18
Diluted		$ 3.44	$ 3.21	$ 3.17
Xcel Energy Inc.
Income
Income (Loss) from Equity Method Investments		$ 2,122	$ 1,948	$ 1,905
Total income		2,122	1,948	1,905
Expenses and other deductions
Operating expenses		24	25	19
Other income		76	13	2
Interest charges and financing costs		300	235	206
Total expenses and other deductions		248	247	223
Income before income taxes		1,874	1,701	1,682
Income tax benefit		(62)	(70)	(54)
Net income		1,936	1,771	1,736
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net pension and retiree medical (losses) gains arising during the period, net of tax		2	(2)	9
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		24	1	21
Other Comprehensive Income (Loss), Net of Tax		26	(1)	30
Total comprehensive income		$ 1,962	$ 1,770	$ 1,766

[1] Diluted common shares outstanding included common stock equivalents of 0.5 million, 0.3 million, and 0.3 million shares for 2024, 2023 and 2022, respectively.