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Commitments and Contingencies, Fuel Contracts (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
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]  
2024 $ 9
2025 0
2026 0
2027 0
2028 0
Thereafter 0
Total 9 [1]
Natural Gas Storage and Transportation  
Fuel Contracts [Abstract]  
2024 21
2025 19
2026 19
2027 13
2028 3
Thereafter 8
Total 83 [1]
RDF/wood  
Fuel Contracts [Abstract]  
2024 6
2025 1
2026 1
2027 0
2028 1
Thereafter 1
Total $ 10 [1]
[1] Excludes additional amounts allocated to NSP-Minnesota through intercompany charges.