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Contingencies and Commitments (Contingencies And Commitments) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2022 USD ($) site | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) site | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | $ 3,427 |  | $ 3,427 |  | $ 2,259
Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 3,427 |  | 3,427 |  | 2,259
Cost of gas sold |  |  |  | $ 114 | $ 53 | $ 792 | $ 425 |
Consumers Energy Company | Ludington |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Ownership share |  |  |  | 51.00% |  | 51.00% |  |
Consumers Energy Company | Ludington Plant Overhaul Contract Dispute |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages sought |  | $ 15 |  |  |  |  |  |
Consumers Energy Company | J.H. Campbell 3 Plant Retirement Contract Dispute |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages sought | $ 37 |  |  |  |  |  |  |
Consumers Energy Company | Manufactured Gas Plant |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | $ 111 |  | $ 111 |  |
Bay Harbor |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | $ 44 |  | $ 44 |  |
Discounted projected costs rate |  |  |  | 4.34% |  | 4.34% |  |
Accrual for environmental loss contingencies, inflation rate |  |  |  | 1.00% |  | 1.00% |  |
Remaining undiscounted obligation amount |  |  |  | $ 54 |  | $ 54 |  |
CERCLA Liability | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | 3 |  | 3 |  |
CERCLA Liability | Minimum | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Remediation and other response activity costs |  |  |  | 3 |  | 3 |  |
CERCLA Liability | Maximum | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Remediation and other response activity costs |  |  |  | 8 |  | 8 |  |
Manufactured Gas Plant | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | $ 63 |  | $ 63 |  |
Discounted projected costs rate |  |  |  | 2.57% |  | 2.57% |  |
Accrual for environmental loss contingencies, inflation rate |  |  |  | 2.50% |  | 2.50% |  |
Remaining undiscounted obligation amount |  |  |  | $ 67 |  | $ 67 |  |
Number of former MGPs | site |  |  |  | 23 |  | 23 |  |
Regulatory asset collection period |  |  |  |  |  | 10 years |  |
Electric Utility | NREPA | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | $ 2 |  | $ 2 |  |
Electric Utility | NREPA | Minimum | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Remediation and other response activity costs |  |  |  | 2 |  | 2 |  |
Electric Utility | NREPA | Maximum | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Remediation and other response activity costs |  |  |  | 4 |  | 4 |  |
Gas Utility | NREPA | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | 1 |  | 1 |  |
Gas Utility | NREPA | Maximum | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Remediation and other response activity costs |  |  |  | $ 3 |  | 3 |  |
Ray Compressor Station | Consumers Energy Company |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Plant additions |  |  |  |  |  |  |  | $ 17
Insurance recoveries received |  |  |  |  |  | 13 |  |
Impairment charge |  |  |  |  |  | $ 10 |  |
Ray Compressor Station | Consumers Energy Company | GCR underrecoveries |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Cost of gas sold |  |  | $ 7 |  |  |  |  |

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