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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Lessee, Lease, Description [Line Items]          
Finance Lease, Right-of-Use Asset, Amortization $ 1 $ 1 $ 3 $ 2  
Finance Lease, Interest Expense 4 4 11 12  
Finance Lease, Cost 5 5 14 14  
Operating Lease, Cost 68 [1] 72 [1] 205 [2] 217 [2]  
Lessee, Operating Lease, Liability, to be Paid 1,401   1,401    
Finance Lease, Liability, Payment, Due [3] 210   210    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (267)   (267)    
Finance Lease, Liability, Undiscounted Excess Amount [3] (148)   (148)    
Operating Lease, Liability 1,134   1,134    
Finance Lease, Liability [3] 62   62    
Operating Lease, Liability, Current (226)   (226)   $ (226)
Finance Lease, Liability, Current [3] (2)   (2)    
Operating lease liabilities 908   908   $ 1,038
Finance Lease, Liability, Noncurrent [3] 60   60    
Short-term Lease, Cost $ 1 3 $ 3 5  
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 $ 57 61 $ 172 182  
Lessee, Operating Lease, Liability, to be Paid 1,037   1,037    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (123)   (123)    
Operating Lease, Liability 914   914    
Property, Plant and Equipment, Other Types          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 11 [4] $ 11 [4] 33 [5] $ 35 [5]  
Lessee, Operating Lease, Liability, to be Paid 364   364    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (144)   (144)    
Operating Lease, Liability $ 220   $ 220    
[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 short-term lease expense of $1 million and $3 million for 2024 and 2023, respectively.
[5] Includes short-term lease expense of $3 million and $5 million for 2024 and 2023, respectively.