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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Lessee, Lease, Description [Line Items]          
Finance Lease, Right-of-Use Asset, Amortization $ 4 $ 1 $ 6 $ 3  
Finance Lease, Interest Expense 14 4 22 11  
Finance Lease, Cost 18 5 28 14  
Operating Lease, Cost 56 68 190 205  
Lessee, Operating Lease, Liability, to be Paid 1,183   1,183    
Finance Lease, Liability, Payment, Due [1] 2,211   2,211    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (298)   (298)    
Finance Lease, Liability, Undiscounted Excess Amount [1] (900)   (900)    
Operating Lease, Liability 885   885    
Finance Lease, Liability [1] 1,311   1,311    
Operating Lease, Liability, Current (114)   (114)   $ (227)
Finance Lease, Liability, Current [1] (39)   (39)    
Operating lease liabilities 771   771   867
Finance Lease, Liability, Noncurrent 1,272 [1]   1,272 [1]   $ 60
NSP-Minnesota          
Lessee, Lease, Description [Line Items]          
Finance Lease, Liability, Current (37)   (37)    
Finance Lease, Liability, Noncurrent $ 1,200   $ 1,200    
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 $ 47 57 $ 158 172  
Lessee, Operating Lease, Liability, to be Paid 667   667    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (98)   (98)    
Operating Lease, Liability 569   569    
Property, Plant and Equipment, Other Types          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 9 [2] $ 11 [2] 32 [3] $ 33 [3]  
Lessee, Operating Lease, Liability, to be Paid 516   516    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (200)   (200)    
Operating Lease, Liability $ 316   $ 316    
[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.