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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Lessee, Lease, Description [Line Items]          
Finance Lease, Right-of-Use Asset, Amortization $ 1 $ 1 $ 2 $ 2  
Finance Lease, Interest Expense 3 3 7 7  
Finance Lease, Cost 4 4 9 9  
Operating Lease, Cost 64 [1] 68 [1] 134 [2] 137 [2]  
Lessee, Operating Lease, Liability, to be Paid 1,480   1,480    
Finance Lease, Liability, Payment, Due [3] 204   204    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (324)   (324)    
Finance Lease, Liability, Undiscounted Excess Amount [3] (143)   (143)    
Operating Lease, Liability 1,156   1,156    
Finance Lease, Liability [3] 61   61    
Operating Lease, Liability, Current (211)   (211)   $ (227)
Finance Lease, Liability, Current [3] (2)   (2)    
Operating lease liabilities 945   945   $ 867
Finance Lease, Liability, Noncurrent [3] $ 59   $ 59    
WYCO, Inc.          
Lessee, Lease, Description [Line Items]          
Equity Method Investment, Ownership Percentage 50.00%   50.00%    
PPAs          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost $ 54 57 $ 111 115  
Lessee, Operating Lease, Liability, to be Paid 954   954    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (120)   (120)    
Operating Lease, Liability 834   834    
Property, Plant and Equipment, Other Types          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 10 [4] $ 11 [4] 23 [5] $ 22 [5]  
Lessee, Operating Lease, Liability, to be Paid 526   526    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (204)   (204)    
Operating Lease, Liability $ 322   $ 322    
[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] 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.
[3] Excludes certain amounts related to Xcel Energy’s 50% ownership interest in WYCO.
[4] Includes immaterial short-term lease expense.
[5] Includes immaterial short-term lease expense.