Share-Based Compensation Expense (Details) - USD ($) shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Expense [Abstract]
Granted (in shares)		658	586	395
Compensation cost for share-based awards	[1]	$ 30	$ 27	$ 36
Tax benefit recognized in income		8	7	9
Unrecognized compensation cost related to nonvested share-based compensation awards		$ 38
Weighted-average period for recognition of unrecognized compensation cost related to nonvested share-based compensation awards (in years)		1 year 8 months 12 days
Compensation Related Costs [Abstract]
Compensation costs for share-based payments included in O&M		$ 33	25	20
Compensation costs for share-based payments included in O&M		$ 33	$ 25	$ 20
Service-based awards [Member]
Share-Based Compensation Expense [Abstract]
Granted (in shares)		500	400	200
Service-based awards [Member] | Xcel Energy Inc. 2015 Omnibus Incentive Plan [Member]
Compensation Related Costs [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized		6,000

[1] Compensation costs for share-based payments are included in O&M expense. Amount for equity awards (non-cash) was $33 million, $25 million and $20 million in 2024, 2023 and 2022, respectively.