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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Lessee, Lease, Description [Line Items]      
Finance Lease, Right-of-Use Asset, Amortization $ 1 $ 1  
Finance Lease, Interest Expense 4 4  
Finance Lease, Cost 5 5  
Operating Lease, Cost [1] 70 69  
Lessee, Operating Lease, Liability, to be Paid 1,382    
Finance Lease, Liability, Payment, Due [2] 206    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (274)    
Finance Lease, Liability, Undiscounted Excess Amount [2] (145)    
Operating Lease, Liability 1,108    
Finance Lease, Liability [2] 61    
Operating Lease, Liability, Current (219)   $ (227)
Finance Lease, Liability, Current [2] (2)    
Operating lease liabilities 889   $ 867
Finance Lease, Liability, Noncurrent [2] $ 59    
WYCO, Inc.      
Lessee, Lease, Description [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
PPAs      
Lessee, Lease, Description [Line Items]      
Operating Lease, Cost $ 57 58  
Lessee, Operating Lease, Liability, to be Paid 1,014    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (131)    
Operating Lease, Liability 883    
Property, Plant and Equipment, Other Types      
Lessee, Lease, Description [Line Items]      
Operating Lease, Cost [3] 13 $ 11  
Lessee, Operating Lease, Liability, to be Paid 368    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (143)    
Operating Lease, Liability $ 225    
[1] PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.
[2] Excludes certain amounts related to Xcel Energy’s 50% ownership interest in WYCO.
[3] Includes immaterial short-term lease expense for the three months ended March 31, 2025 and 2024.