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Income Taxes (Schedule Of Effective Income Rate Reconciliation) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
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% | 4.70% |
TCJA excess deferred taxes | (5.90%) | (4.30%) |
Production tax credits | (5.10%) | (3.10%) |
Accelerated flow-through of regulatory tax benefits | (3.30%) | (1.60%) |
Research and development tax credits, net | (0.30%) | (2.30%) |
Refund of alternative minimum tax sequestration | 0.00% | (2.30%) |
Other, net | 0.40% | (0.30%) |
Effective tax rate | 12.20% | 11.80% |
Refund of alternative minimum tax sequestration |  |  | $ (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 | 5.20% | 5.00% |
TCJA excess deferred taxes | (4.90%) | (3.60%) |
Production tax credits | (3.20%) | (1.60%) |
Accelerated flow-through of regulatory tax benefits | (3.00%) | (1.60%) |
Research and development tax credits, net | (0.20%) | (1.90%) |
Other, net | (0.30%) | (0.50%) |
Effective tax rate | 14.60% | 16.80% |
Research Tax Credit Carryforward |  |  |
Increase (decrease) in income taxes from: |  |  |
Increase (decrease) in tax credit carryforward |  |  | 9
Research Tax Credit Carryforward | Consumers Energy Company |  |  |
Increase (decrease) in income taxes from: |  |  |
Increase (decrease) in tax credit carryforward |  |  | $ 8

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