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Retirement Benefits (Schedule Of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
DB Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 159
2020 162
2021 164
2022 165
2023 165
2024-2028 823
DB Pension Plans | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2019 149
2020 152
2021 154
2022 155
2023 155
2024-2028 777
DB SERP  
Defined Benefit Plan Disclosure [Line Items]  
2019 10
2020 10
2021 10
2022 10
2023 10
2024-2028 46
DB SERP | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2019 7
2020 7
2021 7
2022 7
2023 7
2024-2028 31
OPEB Plan  
Defined Benefit Plan Disclosure [Line Items]  
2019 59
2020 61
2021 64
2022 65
2023 66
2024-2028 328
OPEB Plan | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2019 57
2020 59
2021 61
2022 62
2023 63
2024-2028 $ 315