Leases and Palisades Financing - Minimum Annual Rental Commitments post Topic 842 (Details) $ in Millions	Dec. 31, 2021 USD ($)
Operating Leases
2022	$ 5
2023	2
2024	2
2025	1
2026	1
2027 and thereafter	32
Total minimum lease payments	43
Less discount	17
Present value of minimum lease payments	26
Finance Leases
2022	19
2023	18
2024	16
2025	14
2026	15
2027 and thereafter	60
Total minimum lease payments	142
Less discount	90
Present value of minimum lease payments	52
Consumers Energy Company
Operating Leases
2022	4
2023	2
2024	1
2025	1
2026	1
2027 and thereafter	27
Total minimum lease payments	36
Less discount	14
Present value of minimum lease payments	22
Finance Leases
2022	19
2023	18
2024	16
2025	14
2026	15
2027 and thereafter	60
Total minimum lease payments	142
Less discount	90
Present value of minimum lease payments	52
Pipelines and PPAs
Finance Leases
2022	14
2023	13
2024	13
2025	13
2026	13
2027 and thereafter	51
Total minimum lease payments	117
Less discount	88
Present value of minimum lease payments	29
Pipelines and PPAs | Consumers Energy Company
Finance Leases
2022	14
2023	13
2024	13
2025	13
2026	13
2027 and thereafter	51
Total minimum lease payments	117
Less discount	88
Present value of minimum lease payments	29
Other
Finance Leases
2022	5
2023	5
2024	3
2025	1
2026	2
2027 and thereafter	9
Total minimum lease payments	25
Less discount	2
Present value of minimum lease payments	23
Other | Consumers Energy Company
Finance Leases
2022	5
2023	5
2024	3
2025	1
2026	2
2027 and thereafter	9
Total minimum lease payments	25
Less discount	2
Present value of minimum lease payments	$ 23