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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Lessee, Lease, Description [Line Items]          
Finance Lease, Right-of-Use Asset, Amortization $ 0 $ 1 $ 1 $ 2  
Finance Lease, Interest Expense 4 4 8 8  
Finance Lease, Cost 4 5 9 10  
Operating Lease, Cost 73 [1] 69 [1] 145 [2] 143 [2]  
Lessee, Operating Lease, Liability, to be Paid 1,416   1,416    
Finance Lease, Liability, Payment, Due [3] 222   222    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (224)   (224)    
Finance Lease, Liability, Undiscounted Excess Amount [3] (158)   (158)    
Operating Lease, Liability 1,192   1,192    
Finance Lease, Liability [3] 64   64    
Operating Lease, Liability, Current (226)   (226)   $ (217)
Finance Lease, Liability, Current [3] (2)   (2)    
Operating lease liabilities 966   966   $ 1,038
Finance Lease, Liability, Noncurrent [3] 62   62    
Short-term Lease, Cost $ 3 2 $ 5 3  
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 $ 61 60 $ 121 123  
Lessee, Operating Lease, Liability, to be Paid 1,166   1,166    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (150)   (150)    
Operating Lease, Liability 1,016   1,016    
Property, Plant and Equipment, Other Types          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 12 [4] $ 9 [4] 24 [5] $ 20 [5]  
Lessee, Operating Lease, Liability, to be Paid 250   250    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (74)   (74)    
Operating Lease, Liability $ 176   $ 176    
[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 $3 million and $2 million for 2023 and 2022, respectively.
[5] Includes short-term lease expense of $5 million and $3 million for 2023 and 2022, respectively.