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Commitments and Contingencies, Fuel Contracts (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Minimum annual tolerance band percentage for future rate recovery or refund of fuel costs 2.00%
Natural Gas Supply  
Fuel Contracts [Abstract]  
2025 $ 12
2026 0
2027 0
2028 0
2029 0
Thereafter 0
Total 12 [1]
Natural Gas Storage and Transportation  
Fuel Contracts [Abstract]  
2025 21
2026 22
2027 16
2028 7
2029 6
Thereafter 15
Total 87 [1]
RDF/wood  
Fuel Contracts [Abstract]  
2025 5
2026 1
2027 1
2028 1
2029 1
Thereafter 1
Total $ 10 [1]
[1] Excludes additional amounts allocated from NSP-Minnesota through interchange billings.