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Leases (Schedule of Lessee Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Cash paid for amounts included in the measurement of lease liabilities |  |
Cash used in operating activities for operating leases | $ 6 | $ 6
Cash used in operating activities for finance leases | 15 | 15
Cash used in financing activities for finance leases | 6 | 8
Lease liabilities arising from obtaining right-of-use assets |  |
Operating leases | 3 | 1
Finance leases | 55 | 0
Consumers Energy Company |  |
Cash paid for amounts included in the measurement of lease liabilities |  |
Cash used in operating activities for operating leases | 5 | 6
Cash used in operating activities for finance leases | 13 | 13
Cash used in financing activities for finance leases | 5 | 8
Lease liabilities arising from obtaining right-of-use assets |  |
Operating leases | 1 | 1
Finance leases | $ 34 | $ 0

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- Definition Amount of interest paid on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-5 + Details
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