XML 71 R54.htm IDEA: XBRL DOCUMENT v3.20.2
Retirement Benefits (Schedule Of Net Benefit Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
DB Pension Plans        
Net periodic cost (credit)        
Service cost $ 13 $ 10 $ 25 $ 20
Interest cost 20 24 41 49
Expected return on plan assets (48) (41) (96) (81)
Amortization of:        
Net loss 22 12 44 24
Prior service cost (credit) 1 1 1 1
Net periodic cost (credit) 8 6 15 13
DB Pension Plans | Consumers Energy Company        
Net periodic cost (credit)        
Service cost 12 10 24 20
Interest cost 19 23 39 46
Expected return on plan assets (46) (38) (91) (76)
Amortization of:        
Net loss 21 11 42 23
Prior service cost (credit) 1 1 1 1
Net periodic cost (credit) 7 7 15 14
OPEB Plan        
Net periodic cost (credit)        
Service cost 4 3 8 7
Interest cost 9 10 17 20
Expected return on plan assets (25) (22) (50) (44)
Amortization of:        
Net loss 3 6 7 13
Prior service cost (credit) (14) (15) (28) (31)
Net periodic cost (credit) (23) (18) (46) (35)
OPEB Plan | Consumers Energy Company        
Net periodic cost (credit)        
Service cost 4 4 8 7
Interest cost 8 10 16 20
Expected return on plan assets (24) (20) (47) (41)
Amortization of:        
Net loss 3 6 7 13
Prior service cost (credit) (13) (16) (27) (31)
Net periodic cost (credit) $ (22) $ (16) $ (43) $ (32)