XML 52 R34.htm IDEA: XBRL DOCUMENT
v3.25.3

Retirement Benefits (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs | Presented in the following table are the costs (credits) and other changes in plan assets and benefit obligations incurred in CMS Energy’s and Consumers’ retirement benefit plans:
In Millions
| DB Pension Plans |  | OPEB Plan
| Three Months Ended |  | Nine Months Ended |  | Three Months Ended |  | Nine Months Ended
September 30 | 2025 | 2024 |  | 2025 | 2024 |  |  | 2025 | 2024 |  | 2025 | 2024 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 6 |  |  | $ | 7 |  |  |  | $ | 19 |  |  | $ | 21 |  |  |  |  |  | $ | 2 |  |  | $ | 2 |  |  |  | $ | 6 |  |  | $ | 8 |  |  |
Interest cost |  | 27 |  |  | 26 |  |  |  | 81 |  |  | 78 |  |  |  |  |  | 10 |  |  | 10 |  |  |  | 32 |  |  | 32 |  |  |
Expected return on plan assets |  | (57) |  |  | (58) |  |  |  | (171) |  |  | (176) |  |  |  |  |  | (27) |  |  | (28) |  |  |  | (83) |  |  | (86) |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | 3 |  |  | 3 |  |  |  | 8 |  |  | 9 |  |  |  |  |  | — |  |  | 1 |  |  |  | 2 |  |  | 3 |  |  |
Prior service cost (credit) |  | 1 |  |  | 1 |  |  |  | 3 |  |  | 3 |  |  |  |  |  | (8) |  |  | (7) |  |  |  | (25) |  |  | (23) |  |  |
Settlement loss |  | 3 |  |  | 3 |  |  |  | 8 |  |  | 8 |  |  |  |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  |
Net periodic credit |  | $ | (17) |  |  | $ | (18) |  |  |  | $ | (52) |  |  | $ | (57) |  |  |  |  |  | $ | (23) |  |  | $ | (22) |  |  |  | $ | (68) |  |  | $ | (66) |  |  |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 6 |  |  | $ | 7 |  |  |  | $ | 18 |  |  | $ | 20 |  |  |  |  |  | $ | 2 |  |  | $ | 2 |  |  |  | $ | 6 |  |  | $ | 8 |  |  |
Interest cost |  | 26 |  |  | 25 |  |  |  | 77 |  |  | 74 |  |  |  |  |  | 11 |  |  | 11 |  |  |  | 32 |  |  | 31 |  |  |
Expected return on plan assets |  | (54) |  |  | (56) |  |  |  | (162) |  |  | (166) |  |  |  |  |  | (26) |  |  | (26) |  |  |  | (78) |  |  | (80) |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | 2 |  |  | 3 |  |  |  | 7 |  |  | 8 |  |  |  |  |  | — |  |  | 1 |  |  |  | 2 |  |  | 3 |  |  |
Prior service cost (credit) |  | 1 |  |  | 1 |  |  |  | 3 |  |  | 3 |  |  |  |  |  | (8) |  |  | (8) |  |  |  | (25) |  |  | (23) |  |  |
Settlement loss |  | 3 |  |  | 3 |  |  |  | 8 |  |  | 8 |  |  |  |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  |
Net periodic credit |  | $ | (16) |  |  | $ | (17) |  |  |  | $ | (49) |  |  | $ | (53) |  |  |  |  |  | $ | (21) |  |  | $ | (20) |  |  |  | $ | (63) |  |  | $ | (61) |  |  |
Consumers Energy Company |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs | Presented in the following table are the costs (credits) and other changes in plan assets and benefit obligations incurred in CMS Energy’s and Consumers’ retirement benefit plans:
In Millions
| DB Pension Plans |  | OPEB Plan
| Three Months Ended |  | Nine Months Ended |  | Three Months Ended |  | Nine Months Ended
September 30 | 2025 | 2024 |  | 2025 | 2024 |  |  | 2025 | 2024 |  | 2025 | 2024 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 6 |  |  | $ | 7 |  |  |  | $ | 19 |  |  | $ | 21 |  |  |  |  |  | $ | 2 |  |  | $ | 2 |  |  |  | $ | 6 |  |  | $ | 8 |  |  |
Interest cost |  | 27 |  |  | 26 |  |  |  | 81 |  |  | 78 |  |  |  |  |  | 10 |  |  | 10 |  |  |  | 32 |  |  | 32 |  |  |
Expected return on plan assets |  | (57) |  |  | (58) |  |  |  | (171) |  |  | (176) |  |  |  |  |  | (27) |  |  | (28) |  |  |  | (83) |  |  | (86) |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | 3 |  |  | 3 |  |  |  | 8 |  |  | 9 |  |  |  |  |  | — |  |  | 1 |  |  |  | 2 |  |  | 3 |  |  |
Prior service cost (credit) |  | 1 |  |  | 1 |  |  |  | 3 |  |  | 3 |  |  |  |  |  | (8) |  |  | (7) |  |  |  | (25) |  |  | (23) |  |  |
Settlement loss |  | 3 |  |  | 3 |  |  |  | 8 |  |  | 8 |  |  |  |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  |
Net periodic credit |  | $ | (17) |  |  | $ | (18) |  |  |  | $ | (52) |  |  | $ | (57) |  |  |  |  |  | $ | (23) |  |  | $ | (22) |  |  |  | $ | (68) |  |  | $ | (66) |  |  |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 6 |  |  | $ | 7 |  |  |  | $ | 18 |  |  | $ | 20 |  |  |  |  |  | $ | 2 |  |  | $ | 2 |  |  |  | $ | 6 |  |  | $ | 8 |  |  |
Interest cost |  | 26 |  |  | 25 |  |  |  | 77 |  |  | 74 |  |  |  |  |  | 11 |  |  | 11 |  |  |  | 32 |  |  | 31 |  |  |
Expected return on plan assets |  | (54) |  |  | (56) |  |  |  | (162) |  |  | (166) |  |  |  |  |  | (26) |  |  | (26) |  |  |  | (78) |  |  | (80) |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | 2 |  |  | 3 |  |  |  | 7 |  |  | 8 |  |  |  |  |  | — |  |  | 1 |  |  |  | 2 |  |  | 3 |  |  |
Prior service cost (credit) |  | 1 |  |  | 1 |  |  |  | 3 |  |  | 3 |  |  |  |  |  | (8) |  |  | (8) |  |  |  | (25) |  |  | (23) |  |  |
Settlement loss |  | 3 |  |  | 3 |  |  |  | 8 |  |  | 8 |  |  |  |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  |
Net periodic credit |  | $ | (16) |  |  | $ | (17) |  |  |  | $ | (49) |  |  | $ | (53) |  |  |  |  |  | $ | (21) |  |  | $ | (20) |  |  |  | $ | (63) |  |  | $ | (61) |  |  |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-7 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (m) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cms_ConsumersEnergyCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |