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Contingencies and Commitments (Schedule of Remediation and Other Response Activity Costs by Year) (Details) $ in Millions | Jun. 30, 2023 USD ($)
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Bay Harbor |
Site Contingency [Line Items] |
2023 | $ 2
2024 | 4
2025 | 4
2026 | 4
2027 | 4
2028 | 4
Consumers Energy Company | MGP Sites |
Site Contingency [Line Items] |
2023 | 3
2024 | 2
2025 | 2
2026 | 6
2027 | 9
2028 | $ 23

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