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Commitments and Contingencies - Schedule of Estimated Accrued Costs (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Minnesota and Indiana Gas Service Territories |
Loss Contingencies [Line Items] |
Liability recorded for environmental loss contingencies | $ 13
Minnesota and Indiana Gas Service Territories | Minimum |
Loss Contingencies [Line Items] |
Estimated remediation costs | $ 8
Years to resolve contingency | 5 years
Minnesota and Indiana Gas Service Territories | Maximum |
Loss Contingencies [Line Items] |
Estimated remediation costs | $ 47
Years to resolve contingency | 50 years
Minnesota Service Territory | CERC |
Loss Contingencies [Line Items] |
Liability recorded for environmental loss contingencies | $ 11
Minnesota Service Territory | CERC | Minimum |
Loss Contingencies [Line Items] |
Estimated remediation costs | $ 7
Years to resolve contingency | 5 years
Minnesota Service Territory | CERC | Maximum |
Loss Contingencies [Line Items] |
Estimated remediation costs | $ 41
Years to resolve contingency | 50 years

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