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Income Taxes (Schedule Of Effective Income Rate Reconciliation) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |
Income from continuing operations before income taxes |  | $ 829 | $ 774 | $ 886
Income tax expense at statutory rate |  | 174 | 163 | 310
Increase (decrease) in income taxes from: |  |  |  |
State and local income taxes, net of federal effect |  | 48 | 46 | 26
TCJA excess deferred taxes |  | (31) | (26) | 0
Production tax credits |  | (20) | (14) | (8)
Accelerated flow-through of regulatory tax benefits2 |  | (13) | (39) | (39)
Research and development tax credits, net |  | (2) | (11) | (1)
Impact of the TCJA |  | 0 | (4) | 148
Other, net |  | (9) | 0 | (12)
Tax expense |  | $ 147 | $ 115 | $ 424
Effective tax rate |  | 17.70% | 14.90% | 47.90%
Income tax benefit |  |  |  | $ 14
Valuation allowance |  | $ 2 | $ 8 |
Consumers Energy Company |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income from continuing operations before income taxes |  | 928 | 847 | 971
Income tax expense at statutory rate |  | 195 | 178 | 340
Increase (decrease) in income taxes from: |  |  |  |
State and local income taxes, net of federal effect |  | 53 | 51 | 30
TCJA excess deferred taxes |  | (31) | (26) | 0
Production tax credits |  | (12) | (12) | (8)
Accelerated flow-through of regulatory tax benefits2 |  | (13) | (39) | (39)
Research and development tax credits, net |  | (2) | (11) | (1)
Impact of the TCJA |  | 0 | 1 | 33
Other, net |  | (5) | 0 | (16)
Tax expense |  | $ 185 | $ 142 | $ 339
Effective tax rate |  | 19.90% | 16.80% | 34.90%
Reduction of income tax expense |  |  |  | $ 14
Net regulatory tax liability |  | $ 3,829 | $ 3,836 |
Plant, property, and equipment (subject to normalization) | Consumers Energy Company |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |
Net regulatory tax liability |  |  |  | $ 1,600
Research Tax Credit Carryforward | Consumers Energy Company |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |
Increase in tax credit carryforward | $ 8 |  |  |
Eliminate Write Off of Alternative Minimum Tax Credits |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |
Valuation allowance |  |  | $ 9 |

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