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Retirement Benefits (Schedule Of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2022
USD ($)
DB Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2023 $ 160
2024 158
2025 161
2026 160
2027 159
2028-2032 790
DB Pension Plans | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2023 150
2024 149
2025 151
2026 151
2027 150
2028-2032 745
DB SERP  
Defined Benefit Plan Disclosure [Line Items]  
2023 10
2024 10
2025 10
2026 10
2027 10
2028-2032 45
DB SERP | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2023 7
2024 7
2025 7
2026 7
2027 7
2028-2032 30
OPEB Plan  
Defined Benefit Plan Disclosure [Line Items]  
2023 55
2024 57
2025 58
2026 59
2027 60
2028-2032 312
OPEB Plan | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2023 52
2024 54
2025 55
2026 56
2027 58
2028-2032 $ 298