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Retirement Benefits (Schedule of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2024
USD ($)
DB Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 162
2026 161
2027 162
2028 162
2029 162
2030-2034 802
DB Pension Plans | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2025 152
2026 152
2027 152
2028 152
2029 153
2030-2034 757
DB SERP  
Defined Benefit Plan Disclosure [Line Items]  
2025 10
2026 10
2027 10
2028 9
2029 9
2030-2034 42
DB SERP | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2025 7
2026 7
2027 7
2028 7
2029 6
2030-2034 29
OPEB Plan  
Defined Benefit Plan Disclosure [Line Items]  
2025 59
2026 61
2027 62
2028 63
2029 63
2030-2034 309
OPEB Plan | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2025 56
2026 58
2027 59
2028 60
2029 60
2030-2034 $ 296