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Leases (Summary of Lease Right-of-Use Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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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 | $ 24 | $ 26
Lease liabilities |  |
Current lease liabilities | 3 | 4
Noncurrent lease liabilities | 21 | 22
Finance leases |  |
Right-of-use assets | 119 | 71
Lease liabilities |  |
Current lease liabilities | 4 | 5
Non-current lease liabilities | $ 112 | $ 62
Weighted-average remaining lease term (in years) |  |
Operating leases | 20 years | 19 years
Finance leases | 26 years | 19 years
Weighted-average discount rate |  |
Operating leases | 5.30% | 5.20%
Finance leases | 5.80% | 5.30%
Finance lease liability | $ 116 |
Consumers Energy Company |  |
Operating leases |  |
Right-of-use assets | 20 | $ 23
Lease liabilities |  |
Current lease liabilities | 3 | 4
Noncurrent lease liabilities | 17 | 19
Finance leases |  |
Right-of-use assets | 76 | 48
Lease liabilities |  |
Current lease liabilities | 4 | 5
Non-current lease liabilities | $ 69 | $ 39
Weighted-average remaining lease term (in years) |  |
Operating leases | 19 years | 18 years
Finance leases | 22 years | 11 years
Weighted-average discount rate |  |
Operating leases | 5.40% | 5.30%
Finance leases | 4.80% | 1.50%
Finance lease liability | $ 73 |
Related Party Lease |  |
Lease liabilities |  |
Current lease liabilities | 1 | $ 1
Weighted-average discount rate |  |
Finance lease liability | $ 23 | $ 23

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