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Retirement Benefits (Schedule of Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
DB Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 158
2025 160
2026 159
2027 159
2028 159
2029-2033 785
DB Pension Plans | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2024 148
2025 151
2026 150
2027 150
2028 150
2029-2033 741
DB SERP  
Defined Benefit Plan Disclosure [Line Items]  
2024 10
2025 10
2026 10
2027 10
2028 9
2029-2033 43
DB SERP | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2024 7
2025 7
2026 7
2027 7
2028 6
2029-2033 29
OPEB Plan  
Defined Benefit Plan Disclosure [Line Items]  
2024 55
2025 57
2026 58
2027 60
2028 61
2029-2033 315
OPEB Plan | Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
2024 53
2025 54
2026 56
2027 57
2028 59
2029-2033 $ 301