v3.26.1
Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Lessee, Lease, Description [Line Items]          
Finance Lease, Right-of-Use Asset, Amortization $ 10 $ 1 $ 20 $ 2  
Finance Lease, Interest Expense 25 3 47 7  
Finance Lease, Cost 35 4 67 9  
Operating Lease, Cost 36 64 78 134  
Lessee, Operating Lease, Liability, to be Paid 1,241   1,241    
Finance Lease, Liability, Payment, Due [1] 2,192   2,192    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (375)   (375)    
Finance Lease, Liability, Undiscounted Excess Amount [1] (864)   (864)    
Operating Lease, Liability 866   866    
Finance Lease, Liability [1] 1,328   1,328    
Operating Lease, Liability, Current (107)   (107)   $ (110)
Finance Lease, Liability, Current [1] (40)   (40)    
Operating lease liabilities 759   759   788
Finance Lease, Liability, Noncurrent $ 1,288 [1]   $ 1,288 [1]   $ 1,262
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 $ 31 54 $ 60 111  
Lessee, Operating Lease, Liability, to be Paid 572   572    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (80)   (80)    
Operating Lease, Liability 492   492    
Property, Plant and Equipment, Other Types          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost [2] 5 $ 10 18 $ 23  
Lessee, Operating Lease, Liability, to be Paid 669   669    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (295)   (295)    
Operating Lease, Liability $ 374   $ 374    
[1] Excludes certain amounts related to PSCo’s lease obligations given Xcel Energy’s 50% ownership interest in WYCO.
[2] Includes immaterial short-term lease expense.