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Retirement Benefits (Schedule Of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
DB Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 191
2022 188
2023 184
2024 182
2025 182
2026-2030 890
DB Pension Plans | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2021 181
2022 178
2023 175
2024 173
2025 172
2026-2030 845
DB SERP  
Defined Benefit Plan Disclosure [Line Items]  
2021 10
2022 10
2023 10
2024 10
2025 10
2026-2030 46
DB SERP | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2021 7
2022 7
2023 7
2024 7
2025 7
2026-2030 32
OPEB Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 52
2022 54
2023 56
2024 57
2025 58
2026-2030 299
OPEB Plan | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2021 50
2022 52
2023 53
2024 55
2025 56
2026-2030 $ 286