Contingencies and Commitments (Schedule of Contractual Purchase Obligations) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Guarantees And Other Contingencies [Line Items]
Total	$ 10,695
2024	2,431
2025	1,677
2026	1,084
2027	994
2028	852
Beyond 2028	3,657
Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Total	10,006
2024	2,326
2025	1,440
2026	1,049
2027	955
2028	784
Beyond 2028	3,452
Total PPAs \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Total	7,204
2024	711
2025	792
2026	783
2027	787
2028	702
Beyond 2028	3,429
Other
Guarantees And Other Contingencies [Line Items]
Total	3,491
2024	1,720
2025	885
2026	301
2027	207
2028	150
Beyond 2028	228
Other \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Total	2,802
2024	1,615
2025	648
2026	266
2027	168
2028	82
Beyond 2028	23
MCV PPA \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Total	2,506
2024	342
2025	402
2026	416
2027	410
2028	371
Beyond 2028	565
Related-party PPAs \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Total	206
2024	60
2025	44
2026	30
2027	31
2028	14
Beyond 2028	27
Other PPAs \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Total	4,492
2024	309
2025	346
2026	337
2027	346
2028	317
Beyond 2028	$ 2,837

Guarantees And Other Contingencies [Line Items]

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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+ References

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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