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Commitments and Contingencies - Schedule of Estimated Accrued Costs (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($)
Minnesota and Indiana Gas Service Territories |
Loss Contingencies [Line Items] |
Amount accrued for remediation | $ 13
Minnesota and Indiana Gas Service Territories | Minimum |
Loss Contingencies [Line Items] |
Site Contingency Loss Exposure | $ 8
Site Contingency, Years To Resolve Contingency | 5 years
Minnesota and Indiana Gas Service Territories | Maximum |
Loss Contingencies [Line Items] |
Site Contingency Loss Exposure | $ 51
Site Contingency, Years To Resolve Contingency | 50 years
Minnesota Service Territory | CERC Corp |
Loss Contingencies [Line Items] |
Amount accrued for remediation | $ 11
Minnesota Service Territory | CERC Corp | Minimum |
Loss Contingencies [Line Items] |
Site Contingency Loss Exposure | $ 7
Site Contingency, Years To Resolve Contingency | 5 years
Minnesota Service Territory | CERC Corp | Maximum |
Loss Contingencies [Line Items] |
Site Contingency Loss Exposure | $ 44
Site Contingency, Years To Resolve Contingency | 50 years

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