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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | 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 | 4.70% | 5.40% |
TCJA excess deferred taxes | (4.00%) | (3.40%) |
Production tax credits | (3.00%) | (2.50%) |
Research and development tax credits, net | (1.50%) | (0.20%) |
Alternative minimum tax sequestration | (1.30%) | 0.00% |
Accelerated flow-through of regulatory tax benefits | (1.50%) | (1.50%) |
Other, net | (0.20%) | (1.20%) |
Effective tax rate | 14.20% | 17.60% |
AMT sequestration income tax benefit | $ 9 |  |
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 | 5.00% | 5.70% |
TCJA excess deferred taxes | (3.60%) | (3.20%) |
Production tax credits | (1.90%) | (1.60%) |
Research and development tax credits, net | (1.30%) | (0.20%) |
Accelerated flow-through of regulatory tax benefits | (1.10%) | (1.00%) |
Other, net | (0.30%) | (0.40%) |
Effective tax rate | 17.80% | 20.30% |
Reduction of income tax expense | $ 8 | $ 7 |
Research Tax Credit Carryforward |  |  |
Increase (decrease) in income taxes from: |  |  |
Increase in credit | 9 |  |
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 |  |  | $ 1,600

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