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Contingencies and Commitments (Schedule of Remediation and Other Response Activity Costs by Year) (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Bay Harbor  
Site Contingency [Line Items]  
2023 $ 1
2024 4
2025 4
2026 4
2027 4
2028 4
Consumers Energy Company | MGP Sites  
Site Contingency [Line Items]  
2023 1
2024 2
2025 1
2026 7
2027 10
2028 $ 25