Commitments and Contingencies - Schedule of Estimated Accrued Costs (Details) $ in Millions	12 Months Ended
	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