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Income Taxes (Schedule Of Effective Income Rate Reconciliation) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
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 1.70% 5.60%
Renewable energy tax credits (6.90%) (5.80%)
TCJA excess deferred taxes (3.90%) (7.20%)
Accelerated flow-through of regulatory tax benefits 0.00% (4.30%)
Other, net 0.80% 0.70%
Effective tax rate 12.70% 10.00%
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 2.90% 5.30%
Renewable energy tax credits (4.50%) (4.30%)
TCJA excess deferred taxes (3.70%) (5.90%)
Accelerated flow-through of regulatory tax benefits 0.00% (3.50%)
Other, net (0.10%) 0.10%
Effective tax rate 15.60% 12.70%
Consumers Energy Company | Non-Michigan Jurisdiction    
Increase (decrease) in income taxes from:    
Reversal of tax reserve $ 13