Leases and Palisades Financing - Minimum Annual Rental Commitments post Topic 842 (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leases
2020	$ 11
2021	11
2022	5
2023	3
2024	2
2025 and thereafter	35
Total minimum lease payments	67
Less discount	21
Present value of minimum lease payments	46
Finance Leases
2020	23
2021	23
2022	19
2023	18
2024	16
2025 and thereafter	90
Total minimum lease payments	189
Less discount	123
Present value of minimum lease payments	66
Consumers Energy Company
Operating Leases
2020	9
2021	9
2022	4
2023	3
2024	2
2025 and thereafter	29
Total minimum lease payments	56
Less discount	16
Present value of minimum lease payments	40
Finance Leases
2020	23
2021	23
2022	19
2023	18
2024	16
2025 and thereafter	90
Total minimum lease payments	189
Less discount	123
Present value of minimum lease payments	66
Pipelines and PPAs
Finance Leases
2020	17
2021	17
2022	14
2023	13
2024	13
2025 and thereafter	78
Total minimum lease payments	152
Less discount	119
Present value of minimum lease payments	33
Pipelines and PPAs | Consumers Energy Company
Finance Leases
2020	17
2021	17
2022	14
2023	13
2024	13
2025 and thereafter	78
Total minimum lease payments	152
Less discount	119
Present value of minimum lease payments	33
Other
Finance Leases
2020	6
2021	6
2022	5
2023	5
2024	3
2025 and thereafter	12
Total minimum lease payments	37
Less discount	4
Present value of minimum lease payments	33
Other | Consumers Energy Company
Finance Leases
2020	6
2021	6
2022	5
2023	5
2024	3
2025 and thereafter	12
Total minimum lease payments	37
Less discount	4
Present value of minimum lease payments	$ 33