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Contingencies And Commitments (Expected Remediation Cost By Year) (Details)
$ in Millions
Mar. 31, 2016
USD ($)
Manufactured Gas Plant [Member] | Consumers Energy Company [Member]  
Site Contingency [Line Items]  
Undiscounted amount due within one year $ 15
Undiscounted amount due within two year 20
Undiscounted amount due within third year 11
Undiscounted amount due within fourth year 14
Undiscounted amount due within five year 19
Bay Harbor [Member]  
Site Contingency [Line Items]  
Undiscounted amount due within one year 6
Undiscounted amount due within two year 5
Undiscounted amount due within third year 4
Undiscounted amount due within fourth year 4
Undiscounted amount due within five year $ 4