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Contingencies And Commitments (Expected Remediation Cost By Year) (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Bay Harbor  
Site Contingency [Line Items]  
2020 $ 4
2021 4
2022 4
2023 4
2024 4
2025 4
Gas Utility | Manufactured Gas Plant | Consumers Energy Company  
Site Contingency [Line Items]  
2020 12
2021 8
2022 20
2023 11
2024 2
2025 $ 2