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Leases and Palisades Financing - Assets and Liabilities of Lessee (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Operating leases |  |
Right-of-use assets | $ 34 | $ 47
Lease liabilities |  |
Current lease liabilities | 9 | 9
Noncurrent lease liabilities | 25 | 37
Finance leases |  |
Right-of-use assets | 65 | 71
Lease liabilities |  |
Finance lease liability | 60 |
Current lease liabilities | 7 | 6
Non-current lease liabilities | $ 53 | $ 60
Weighted-average remaining lease term (in years) |  |
Operating leases | 19 years | 17 years
Finance leases | 12 years | 12 years
Weighted-average discount rate |  |
Operating leases | 3.90% | 3.80%
Finance leases | 1.80% | 1.90%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssetsNoncurrent |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesCurrent | us-gaap:OtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent | us-gaap:OtherLiabilitiesNoncurrent
Consumers Energy Company |  |
Operating leases |  |
Right-of-use assets | $ 28 | $ 40
Lease liabilities |  |
Current lease liabilities | 7 | 8
Noncurrent lease liabilities | 21 | 32
Finance leases |  |
Right-of-use assets | 65 | 71
Lease liabilities |  |
Finance lease liability | 60 |
Current lease liabilities | 7 | 6
Non-current lease liabilities | $ 53 | $ 60
Weighted-average remaining lease term (in years) |  |
Operating leases | 18 years | 14 years
Finance leases | 12 years | 12 years
Weighted-average discount rate |  |
Operating leases | 3.80% | 3.70%
Finance leases | 1.80% | 1.90%
Related Party Lease |  |
Lease liabilities |  |
Finance lease liability | $ 25 | $ 25
Current lease liabilities | $ 1 | $ 1

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