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Retirement Benefits (Schedule Of Expected Benefit Payments) (Details) $ in Millions | Dec. 31, 2021 USD ($)
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DB Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
2022 | $ 185
2023 | 181
2024 | 178
2025 | 180
2026 | 178
2027-2031 | 876
DB Pension Plans | Consumers Energy Company |
Defined Benefit Plan Disclosure [Line Items] |
2022 | 175
2023 | 171
2024 | 169
2025 | 170
2026 | 169
2027-2031 | 830
DB SERP |
Defined Benefit Plan Disclosure [Line Items] |
2022 | 10
2023 | 10
2024 | 10
2025 | 10
2026 | 9
2027-2031 | 45
DB SERP | Consumers Energy Company |
Defined Benefit Plan Disclosure [Line Items] |
2022 | 7
2023 | 7
2024 | 7
2025 | 7
2026 | 6
2027-2031 | 31
OPEB Plan |
Defined Benefit Plan Disclosure [Line Items] |
2022 | 52
2023 | 54
2024 | 56
2025 | 58
2026 | 59
2027-2031 | 308
OPEB Plan | Consumers Energy Company |
Defined Benefit Plan Disclosure [Line Items] |
2022 | 49
2023 | 52
2024 | 54
2025 | 55
2026 | 56
2027-2031 | $ 294

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