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Contingencies and Commitments (Guarantees) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) $ / MW $ / MWh MW | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Guarantees And Other Contingencies [Line Items] |  |  |
Total | $ 12,473 |  |
2022 | 2,317 |  |
2023 | 2,404 |  |
2024 | 1,174 |  |
2025 | 1,348 |  |
2026 | 642 |  |
Beyond 2026 | 4,588 |  |
Other |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Total | 4,445 |  |
2022 | 1,489 |  |
2023 | 1,657 |  |
2024 | 412 |  |
2025 | 639 |  |
2026 | 36 |  |
Beyond 2026 | $ 212 |  |
Variable Interest Entity, Primary Beneficiary | Aviator Wind Class B Membership |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Ownership percentage | 49.00% |  |
Consumers Energy Company |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Total | $ 11,978 |  |
2022 | 2,209 |  |
2023 | 2,343 |  |
2024 | 1,126 |  |
2025 | 1,303 |  |
2026 | 618 |  |
Beyond 2026 | $ 4,379 |  |
Consumers Energy Company | Palisades Power Purchase Agreement | Financing Obligation |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Annual average capacity (in MW) | MW | 798 |  |
Consumers Energy Company | Total PPAs |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Total | $ 8,028 |  |
2022 | 828 |  |
2023 | 747 |  |
2024 | 762 |  |
2025 | 709 |  |
2026 | 606 |  |
Beyond 2026 | 4,376 |  |
Consumers Energy Company | Other |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Total | 3,950 |  |
2022 | 1,381 |  |
2023 | 1,596 |  |
2024 | 364 |  |
2025 | 594 |  |
2026 | 12 |  |
Beyond 2026 | 3 |  |
Consumers Energy Company | MCV PPA |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Total | 2,204 |  |
2022 | 349 |  |
2023 | 348 |  |
2024 | 346 |  |
2025 | 306 |  |
2026 | 231 |  |
Beyond 2026 | $ 624 |  |
PPA minimum quantity required | MW | 1,240 |  |
PPA fixed energy charge per MWh, on-peak (in dollars per MWh) | $ / MWh | 6.30 |  |
PPA fixed energy charge per MWh, off-peak (in dollars per MWh) | $ / MWh | 6.00 |  |
Annual contribution to renewable resources program by counterparty | $ 5 |  |
Purchases | $ 348 | $ 298 | $ 318
Consumers Energy Company | MCV PPA | Year End Through March 2025 |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
PPA capacity charge per MWh (in dollars per MWh) | $ / MW | 10.14 |  |
Consumers Energy Company | MCV PPA | March 2025 Through Termination |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
PPA capacity charge per MWh (in dollars per MWh) | $ / MW | 5.00 |  |
Consumers Energy Company | Palisades PPA |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Total | $ 116 |  |
2022 | 116 |  |
2023 | 0 |  |
2024 | 0 |  |
2025 | 0 |  |
2026 | 0 |  |
Beyond 2026 | 0 |  |
Purchases | 413 | 403 | 395
Consumers Energy Company | Related-party PPAs |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Total | 342 |  |
2022 | 65 |  |
2023 | 65 |  |
2024 | 65 |  |
2025 | 47 |  |
2026 | 29 |  |
Beyond 2026 | 71 |  |
Consumers Energy Company | Other PPAs |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Total | 5,366 |  |
2022 | 298 |  |
2023 | 334 |  |
2024 | 351 |  |
2025 | 356 |  |
2026 | 346 |  |
Beyond 2026 | 3,681 |  |
Purchases | $ 338 | $ 327 | $ 336
Guarantees |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Expiration Date | indefinite |  |
Maximum Obligation | $ 30 |  |
Carrying Amount | $ 0 |  |
Guarantees | Consumers Energy Company |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Expiration Date | indefinite |  |
Maximum Obligation | $ 30 |  |
Carrying Amount | $ 0 |  |
Indemnification Agreement From Purchase Of Variable Interest Entity |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Expiration Date | indefinite |  |
Maximum Obligation | $ 314 |  |
Carrying Amount | $ 0 |  |
Indemnity Obligations From Stock And Asset Sales Agreements |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Expiration Date | indefinite |  |
Maximum Obligation | $ 225 |  |
Carrying Amount | 4 |  |
Tax And Other Indemnity Obligations | Consumers Energy Company |  |  |
Guarantees And Other Contingencies [Line Items] |  |  |
Carrying Amount | $ 1 |  |

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