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Retirement Benefits (Schedule Of Net Benefit Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
DB Pension Plans        
Defined Benefit Plan, Roll Forwards [Abstract]        
Service cost $ 11 $ 13 $ 23 $ 27
Interest cost 20 15 38 30
Expected return on plan assets (52) (52) (104) (104)
Amortization of        
Net loss 10 26 27 51
Prior service cost (credit) 1 1 2 2
Settlement loss 2 2 4 3
Net periodic cost (credit) (8) 5 (10) 9
DB Pension Plans | Consumers Energy Company        
Defined Benefit Plan, Roll Forwards [Abstract]        
Service cost 11 13 23 26
Interest cost 20 14 36 28
Expected return on plan assets (50) (49) (99) (98)
Amortization of        
Net loss 9 24 25 49
Prior service cost (credit) 1 1 2 2
Settlement loss 2 2 4 3
Net periodic cost (credit) (7) 5 (9) 10
OPEB Plan        
Defined Benefit Plan, Roll Forwards [Abstract]        
Service cost 5 5 9 9
Interest cost 7 5 14 11
Expected return on plan assets (29) (27) (58) (54)
Amortization of        
Net loss 1 2 1 4
Prior service cost (credit) (14) (13) (26) (26)
Settlement loss 0 0 0 0
Net periodic cost (credit) (30) (28) (60) (56)
OPEB Plan | Consumers Energy Company        
Defined Benefit Plan, Roll Forwards [Abstract]        
Service cost 5 5 9 9
Interest cost 7 5 14 11
Expected return on plan assets (27) (26) (54) (51)
Amortization of        
Net loss 0 2 0 4
Prior service cost (credit) (13) (13) (25) (26)
Settlement loss 0 0 0 0
Net periodic cost (credit) $ (28) $ (27) $ (56) $ (53)