Contingencies and Commitments (Schedule of Contractual Purchase Obligations) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Guarantees And Other Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 12,521
2023	3,165
2024	1,695
2025	1,144
2026	853
2027	878
Beyond 2027	4,786
Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	11,901
2023	3,046
2024	1,628
2025	986
2026	823
2027	848
Beyond 2027	4,570
Total PPAs \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	8,479
2023	652
2024	792
2025	809
2026	812
2027	847
Beyond 2027	4,567
Other
Guarantees And Other Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	4,042
2023	2,513
2024	903
2025	335
2026	41
2027	31
Beyond 2027	219
Other \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	3,422
2023	2,394
2024	836
2025	177
2026	11
2027	1
Beyond 2027	3
MCV PPA \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	2,317
2023	286
2024	369
2025	357
2026	384
2027	406
Beyond 2027	515
Related-party PPAs \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	320
2023	76
2024	76
2025	53
2026	35
2027	38
Beyond 2027	42
Other PPAs \| Consumers Energy Company
Guarantees And Other Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation	5,842
2023	290
2024	347
2025	399
2026	393
2027	403
Beyond 2027	$ 4,010

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

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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).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in second 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).

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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).

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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).

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

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