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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]          
Finance Lease, Right-of-Use Asset, Amortization $ 2 $ 2 $ 6 $ 5  
Finance Lease, Interest Expense 4 4 12 13  
Finance Lease, Cost 6 6 18 18  
Operating Lease, Cost 58 [1] 61 [1] 189 [2] 167 [2]  
Lessee, Operating Lease, Liability, to be Paid 1,661   1,661    
Finance Lease, Liability, Payment, Due [3] 246   246    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (256)   (256)    
Finance Lease, Liability, Undiscounted Excess Amount [3] (173)   (173)    
Operating Lease, Liability 1,405   1,405    
Finance Lease, Liability [3] 73   73    
Operating Lease, Liability, Current (218)   (218)   $ (214)
Finance Lease, Liability, Current [3] (3)   (3)    
Operating lease liabilities 1,187   1,187   $ 1,344
Finance Lease, Liability, Noncurrent [3] 70   70    
Short-term Lease, Cost 1 2 4 4  
PPAs          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 56 56 170 145  
Lessee, Operating Lease, Liability, to be Paid 1,470   1,470    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (221)   (221)    
Operating Lease, Liability 1,249   1,249    
Property, Plant and Equipment, Other Types          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 2 [4] $ 5 [4] 19 [5] $ 22 [5]  
Lessee, Operating Lease, Liability, to be Paid 191   191    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (35)   (35)    
Operating Lease, Liability $ 156   $ 156    
[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 $2 million for 2021 and 2020, respectively.
[5] Includes short-term lease expense of $4 million for 2021 and 2020, respectively.