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Retirement Benefits (Schedule of Expected Benefit Payments) (Details) $ in Millions | Dec. 31, 2023 USD ($)
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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

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