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Leases (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Lessee, Lease, Description [Line Items]      
Maximum Length - Short-Term Leases 12 months    
Operating Lease, Weighted Average Discount Rate, Percent 4.40%    
Operating Lease ROU Assets      
Gross operating lease ROU assets $ 2,147,000,000 $ 1,913,000,000  
Accumulated amortization (930,000,000) (709,000,000)  
Net operating lease ROU assets 1,217,000,000 1,204,000,000  
Finance Lease ROU Assets      
Gross finance lease ROU assets 181,000,000 181,000,000  
Accumulated amortization $ (67,000,000) $ (64,000,000)  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
Net finance lease ROU assets $ 114,000,000 $ 117,000,000  
Components of Lease Expense      
Operating Lease, Cost [1] 283,000,000 280,000,000 $ 287,000,000
Finance Lease, Right-of-Use Asset, Amortization 3,000,000 4,000,000 7,000,000
Finance Lease, Interest Expense 15,000,000 16,000,000 17,000,000
Finance Lease, Cost 18,000,000 20,000,000 24,000,000
Short-term Lease, Cost 3,000,000 $ 6,000,000 5,000,000
Operating Lease Commitments      
2024 277,000,000    
2025 271,000,000    
2026 238,000,000    
2027 184,000,000    
2028 129,000,000    
Thereafter 421,000,000    
Total minimum obligation 1,520,000,000    
Interest component of obligation (256,000,000)    
Regulatory liabilities $ 1,264,000,000    
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities  
Less current portion $ (226,000,000) $ (217,000,000)  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities  
Noncurrent operating and finance lease liabilities $ 1,038,000,000 $ 1,038,000,000  
Operating Lease, Weighted Average Remaining Lease Term 8.2    
Finance Lease, Liability, Payment, Due [Abstract]      
2024 [2] 10,000,000    
2025 [2] 10,000,000    
2026 [2] 9,000,000    
2027 [2] 8,000,000    
2028 [2] 8,000,000    
Thereafter [2] 173,000,000    
Total minimum obligation [2] 218,000,000    
Interest component of obligation [2] (154,000,000)    
Present value of minimum obligation [2] 64,000,000    
Finance Lease, Liability, Current [2] (2,000,000)    
Finance Lease, Liability, Noncurrent [2] 62,000,000    
Finance Lease, Weighted Average Remaining Lease Term [2] $ 36.8    
WYCO, Inc. [Member]      
Operating Lease ROU Assets      
Equity Method Investment, Ownership Percentage 50.00%    
Purchased Power Agreements      
Operating Lease ROU Assets      
Gross operating lease ROU assets $ 1,832,000,000 1,669,000,000  
Components of Lease Expense      
Operating Lease, Cost 241,000,000 241,000,000 251,000,000
Operating Lease Commitments      
2024 [3],[4] 244,000,000    
2025 [3],[4] 245,000,000    
2026 [3],[4] 216,000,000    
2027 [3],[4] 162,000,000    
2028 [3],[4] 107,000,000    
Thereafter [3],[4] 259,000,000    
Total minimum obligation [3],[4] 1,233,000,000    
Interest component of obligation [3],[4] (157,000,000)    
Regulatory liabilities [3],[4] 1,076,000,000    
Other Operating Lease [Domain]      
Operating Lease ROU Assets      
Gross operating lease ROU assets 315,000,000 244,000,000  
Components of Lease Expense      
Operating Lease, Cost [5] 42,000,000 39,000,000 $ 36,000,000
Operating Lease Commitments      
2024 33,000,000    
2025 26,000,000    
2026 22,000,000    
2027 22,000,000    
2028 22,000,000    
Thereafter 162,000,000    
Total minimum obligation 287,000,000    
Interest component of obligation (99,000,000)    
Regulatory liabilities 188,000,000    
Gas Storage Facilities [Member]      
Finance Lease ROU Assets      
Gross finance lease ROU assets 160,000,000 160,000,000  
Pipelines [Member]      
Finance Lease ROU Assets      
Gross finance lease ROU assets $ 21,000,000 $ 21,000,000  
[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] Amounts do not include PPAs accounted for as executory contracts and/or contingent payments, such as energy payments on renewable PPAs.
[4] PPA operating leases contractually expire at various dates through 2039.
[5] Includes short-term lease expense of $3 million, $6 million, and $5 million for 2023, 2022 and 2021, respectively.