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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
U.S. federal income tax rate |  | 21.00% | 21.00% |  |
Increase (decrease) in income taxes from: |  |  |  |  |
State and local income taxes, net of federal effect |  | 5.40% | 5.90% |  |
TCJA excess deferred taxes |  | (3.40%) | (3.40%) |  |
Production tax credits |  | (2.50%) | (2.00%) |  |
Accelerated flow-through of regulatory tax benefits |  | (1.50%) | (5.00%) |  |
Research and development tax credits, net |  | (0.20%) | (1.60%) |  |
Other, net |  | (1.20%) | 0.20% |  |
Effective tax rate |  | 17.60% | 15.10% |  |
Regulatory liabilities, noncurrent |  | $ 3,754 |  | $ 3,681 |
Consumers Energy Company |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
U.S. federal income tax rate |  | 21.00% | 21.00% |  |
Increase (decrease) in income taxes from: |  |  |  |  |
State and local income taxes, net of federal effect |  | 5.70% | 6.10% |  |
TCJA excess deferred taxes |  | (3.20%) | (3.10%) |  |
Production tax credits |  | (1.60%) | (1.60%) |  |
Accelerated flow-through of regulatory tax benefits |  | (1.00%) | (4.40%) |  |
Research and development tax credits, net |  | (0.20%) | (1.50%) |  |
Other, net |  | (0.40%) | (0.30%) |  |
Effective tax rate |  | 20.30% | 16.20% |  |
Regulatory liabilities, noncurrent |  | $ 3,754 |  | $ 3,681 |
Reduction of income tax expense |  | 7 | $ 30 |  |
Research Tax Credit Carryforward | Consumers Energy Company |  |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |  |
Increase in credit | $ 8 |  |  |  |
Plant, Property, And Equipment (Subject To Normalization) | Consumers Energy Company |  |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 1,800
TCJA Reserve For Refund | Consumers Energy Company |  |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |  |
Regulatory liabilities, noncurrent |  | $ 62 |  |  |

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