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Leases (Summary of Lease Right-of-Use Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Lessor, Lease, Description [Line Items] |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other | Other
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities | Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other non‑current liabilities | Other non‑current liabilities
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Plant, property, and equipment, net | Plant, property, and equipment, net
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Current portion of long-term debt and finance leases | Current portion of long-term debt and finance leases
Operating leases |  |
Right-of-use assets | $ 26 | $ 31
Lease liabilities |  |
Current lease liabilities | 4 | 4
Noncurrent lease liabilities | 22 | 27
Finance leases |  |
Right-of-use assets | 71 | 82
Lease liabilities |  |
Current lease liabilities | 5 | 9
Non-current lease liabilities | $ 62 | $ 68
Weighted-average remaining lease term (in years) |  |
Operating leases | 19 years | 20 years
Finance leases | 19 years | 18 years
Weighted-average discount rate |  |
Operating leases | 5.20% | 4.00%
Finance leases | 5.30% | 5.20%
Finance lease liability | $ 67 |
Consumers Energy Company |  |
Operating leases |  |
Right-of-use assets | 23 | $ 27
Lease liabilities |  |
Current lease liabilities | 4 | 4
Noncurrent lease liabilities | 19 | 23
Finance leases |  |
Right-of-use assets | 48 | 58
Lease liabilities |  |
Current lease liabilities | 5 | 9
Non-current lease liabilities | $ 39 | $ 45
Weighted-average remaining lease term (in years) |  |
Operating leases | 18 years | 18 years
Finance leases | 11 years | 10 years
Weighted-average discount rate |  |
Operating leases | 5.30% | 3.90%
Finance leases | 1.50% | 1.60%
Finance lease liability | $ 44 |
Related Party Lease |  |
Lease liabilities |  |
Current lease liabilities | 1 | $ 1
Weighted-average discount rate |  |
Finance lease liability | $ 24 | $ 24

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