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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Lessee, Lease, Description [Line Items]      
Finance Lease, Right-of-Use Asset, Amortization $ 1 $ 1  
Finance Lease, Interest Expense 4 4  
Finance Lease, Cost 5 5  
Operating Lease, Cost [1] 72 76  
Lessee, Operating Lease, Liability, to be Paid 1,480    
Finance Lease, Liability, Payment, Due [2] 225    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (236)    
Finance Lease, Liability, Undiscounted Excess Amount [2] (160)    
Operating Lease, Liability 1,244    
Finance Lease, Liability [2] 65    
Operating Lease, Liability, Current (224)   $ (217)
Finance Lease, Liability, Current [2] (2)    
Operating lease liabilities 1,020   $ 1,038
Finance Lease, Liability, Noncurrent [2] 63    
Short-term Lease, Cost $ 2 1  
WYCO, Inc.      
Lessee, Lease, Description [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
PPAs      
Lessee, Lease, Description [Line Items]      
Operating Lease, Cost $ 60 63  
Lessee, Operating Lease, Liability, to be Paid 1,223    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (160)    
Operating Lease, Liability 1,063    
Property, Plant and Equipment, Other Types      
Lessee, Lease, Description [Line Items]      
Operating Lease, Cost [3] 12 $ 13  
Lessee, Operating Lease, Liability, to be Paid 257    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (76)    
Operating Lease, Liability $ 181    
[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] Excludes certain amounts related to Xcel Energy’s 50% ownership interest in WYCO.
[3] Includes short-term lease expense of $2 million and $1 million for 2023 and 2022, respectively.