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Retirement Benefits (Schedule of Expected Benefit Payments) (Details) $ in Millions | Dec. 31, 2024 USD ($)
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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

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