v3.26.3
Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Lessee, Lease, Description [Line Items]          
Finance Lease, Right-of-Use Asset, Amortization $ 10 $ 4 $ 30 $ 6  
Finance Lease, Interest Expense 25 14 72 22  
Finance Lease, Cost 35 18 102 28  
Operating Lease, Cost 47 56 125 190  
Lessee, Operating Lease, Liability, to be Paid 1,202   1,202    
Finance Lease, Liability, Payment, Due [1] 2,160   2,160    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (364)   (364)    
Finance Lease, Liability, Undiscounted Excess Amount [1] (843)   (843)    
Operating Lease, Liability 838   838    
Finance Lease, Liability [1] 1,317   1,317    
Operating Lease, Liability, Current (100)   (100)   $ (110)
Finance Lease, Liability, Current [1] (40)   (40)    
Operating lease liabilities 738   738   788
Finance Lease, Liability, Noncurrent $ 1,277 [1]   $ 1,277 [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 47 $ 91 158  
Lessee, Operating Lease, Liability, to be Paid 542   542    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (74)   (74)    
Operating Lease, Liability 468   468    
Property, Plant and Equipment, Other Types          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 16 [2] $ 9 [2] 34 [3] $ 32 [3]  
Lessee, Operating Lease, Liability, to be Paid 660   660    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (290)   (290)    
Operating Lease, Liability $ 370   $ 370    
[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.
[3] Includes immaterial short-term lease expense.