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Cover Page
Jul. 01, 2021
Feb. 08, 2021
Document Information [Line Items]    
Amendment Flag false  
Entity Registrant Name XCEL ENERGY INC  
Entity Central Index Key 0000072903  
Entity Incorporation, State or Country Code MN  
Document Type 8-K  
Document Period End Date   Jul. 01, 2021
Entity File Number 001-3034  
Entity Tax Identification Number 41-0448030  
Entity Address, Address Line One 414 Nicollet Mall  
Entity Address, City or Town Minneapolis  
Entity Address, State or Province MN  
Entity Address, Postal Zip Code 55401  
City Area Code (612)  
Local Phone Number 330-5500  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security Common Stock, $2.50 par value per share  
Trading Symbol XEL  
Security Exchange Name NASDAQ  
Entity Emerging Growth Company false  
Northern States Power Co. MN    
Document Information [Line Items]    
Entity Registrant Name NORTHERN STATES POWER CO  
Entity Central Index Key 0001123852  
Entity Incorporation, State or Country Code MN  
Entity File Number 001-31387  
Entity Tax Identification Number 41-1967505  
Entity Address, Address Line One 414 Nicollet Mall  
Entity Address, City or Town   Minneapolis
Entity Address, State or Province MN  
Entity Address, Postal Zip Code 55401  
City Area Code (612)  
Local Phone Number 330-5500