Leases And Palisades Financing (Schedule of Future Minimum Lease Payments for Leases) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Capital and Financing Leases
Non-current portion	$ 69	$ 91
Operating Leases
2019	16
2020	15
2021	15
2022	8
2023	5
2024 and thereafter	38
Total minimum lease payments	97
Capital Leases
Capital and Financing Leases
2019	14
2020	11
2021	11
2022	8
2023	6
2024 and thereafter	21
Total minimum lease payments	71
Less imputed interest	22
Present value of net minimum lease payments	49
Current Portion	9
Non-current portion	40
Palisades Financing
Capital and Financing Leases
2019	15
2020	14
2021	14
2022	3
2023	0
2024 and thereafter	0
Total minimum lease payments	46
Less imputed interest	4
Present value of net minimum lease payments	42
Current Portion	13
Non-current portion	29
Consumers Energy Company
Capital and Financing Leases
Non-current portion	69	$ 91
Operating Leases
2019	14
2020	14
2021	13
2022	7
2023	5
2024 and thereafter	32
Total minimum lease payments	85
Consumers Energy Company | Capital Leases
Capital and Financing Leases
2019	14
2020	11
2021	11
2022	8
2023	6
2024 and thereafter	21
Total minimum lease payments	71
Less imputed interest	22
Present value of net minimum lease payments	49
Current Portion	9
Non-current portion	40
Consumers Energy Company | Palisades Financing
Capital and Financing Leases
2019	15
2020	14
2021	14
2022	3
2023	0
2024 and thereafter	0
Total minimum lease payments	46
Less imputed interest	4
Present value of net minimum lease payments	42
Current Portion	13
Non-current portion	$ 29