XML 42 R22.htm IDEA: XBRL DOCUMENT
v3.23.2

Retirement Benefits | 6 Months Ended
--- | ---
Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |
Retirement Benefits | Retirement BenefitsCMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans. 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 |  | Six Months Ended |  | Three Months Ended |  | Six Months Ended
June 30 | 2023 | 2022 |  | 2023 | 2022 |  |  | 2023 | 2022 |  | 2023 | 2022 |
CMS Energy, including Consumers |  |
Net periodic credit |  |
Service cost |  | $ | 8 |  |  | $ | 11 |  |  |  | $ | 15 |  |  | $ | 23 |  |  |  |  |  | $ | 3 |  |  | $ | 5 |  |  |  | $ | 6 |  |  | $ | 9 |  |  |
Interest cost |  | 26 |  |  | 20 |  |  |  | 53 |  |  | 38 |  |  |  |  |  | 11 |  |  | 7 |  |  |  | 22 |  |  | 14 |  |  |
Expected return on plan assets |  | (55) |  |  | (52) |  |  |  | (110) |  |  | (104) |  |  |  |  |  | (25) |  |  | (29) |  |  |  | (51) |  |  | (58) |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | 3 |  |  | 10 |  |  |  | 6 |  |  | 27 |  |  |  |  |  | 3 |  |  | 1 |  |  |  | 6 |  |  | 1 |  |  |
Prior service cost (credit) |  | 1 |  |  | 1 |  |  |  | 2 |  |  | 2 |  |  |  |  |  | (11) |  |  | (14) |  |  |  | (21) |  |  | (26) |  |  |
Settlement loss |  | 3 |  |  | 2 |  |  |  | 5 |  |  | 4 |  |  |  |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  |
Net periodic credit |  | $ | (14) |  |  | $ | (8) |  |  |  | $ | (29) |  |  | $ | (10) |  |  |  |  |  | $ | (19) |  |  | $ | (30) |  |  |  | $ | (38) |  |  | $ | (60) |  |  |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic credit |  |
Service cost |  | $ | 7 |  |  | $ | 11 |  |  |  | $ | 14 |  |  | $ | 23 |  |  |  |  |  | $ | 3 |  |  | $ | 5 |  |  |  | $ | 6 |  |  | $ | 9 |  |  |
Interest cost |  | 26 |  |  | 20 |  |  |  | 51 |  |  | 36 |  |  |  |  |  | 10 |  |  | 7 |  |  |  | 21 |  |  | 14 |  |  |
Expected return on plan assets |  | (52) |  |  | (50) |  |  |  | (104) |  |  | (99) |  |  |  |  |  | (24) |  |  | (27) |  |  |  | (48) |  |  | (54) |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | 2 |  |  | 9 |  |  |  | 5 |  |  | 25 |  |  |  |  |  | 3 |  |  | — |  |  |  | 6 |  |  | — |  |  |
Prior service cost (credit) |  | 1 |  |  | 1 |  |  |  | 2 |  |  | 2 |  |  |  |  |  | (10) |  |  | (13) |  |  |  | (20) |  |  | (25) |  |  |
Settlement loss |  | 3 |  |  | 2 |  |  |  | 5 |  |  | 4 |  |  |  |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  |
Net periodic credit |  | $ | (13) |  |  | $ | (7) |  |  |  | $ | (27) |  |  | $ | (9) |  |  |  |  |  | $ | (18) |  |  | $ | (28) |  |  |  | $ | (35) |  |  | $ | (56) |  |  |
In Consumers’ 2022 electric rate case, the MPSC approved a mechanism allowing Consumers to defer the future recovery or refund of pension and OPEB expenses above or below the amounts used to set existing rates, respectively, beginning in 2023. At June 30, 2023, CMS Energy, including Consumers, had deferred $6 million of pension credits and $12 million of OPEB costs under this mechanism.
Consumers Energy Company |
Defined Benefit Plan Disclosure [Line Items] |
Retirement Benefits | Retirement BenefitsCMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans. 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 |  | Six Months Ended |  | Three Months Ended |  | Six Months Ended
June 30 | 2023 | 2022 |  | 2023 | 2022 |  |  | 2023 | 2022 |  | 2023 | 2022 |
CMS Energy, including Consumers |  |
Net periodic credit |  |
Service cost |  | $ | 8 |  |  | $ | 11 |  |  |  | $ | 15 |  |  | $ | 23 |  |  |  |  |  | $ | 3 |  |  | $ | 5 |  |  |  | $ | 6 |  |  | $ | 9 |  |  |
Interest cost |  | 26 |  |  | 20 |  |  |  | 53 |  |  | 38 |  |  |  |  |  | 11 |  |  | 7 |  |  |  | 22 |  |  | 14 |  |  |
Expected return on plan assets |  | (55) |  |  | (52) |  |  |  | (110) |  |  | (104) |  |  |  |  |  | (25) |  |  | (29) |  |  |  | (51) |  |  | (58) |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | 3 |  |  | 10 |  |  |  | 6 |  |  | 27 |  |  |  |  |  | 3 |  |  | 1 |  |  |  | 6 |  |  | 1 |  |  |
Prior service cost (credit) |  | 1 |  |  | 1 |  |  |  | 2 |  |  | 2 |  |  |  |  |  | (11) |  |  | (14) |  |  |  | (21) |  |  | (26) |  |  |
Settlement loss |  | 3 |  |  | 2 |  |  |  | 5 |  |  | 4 |  |  |  |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  |
Net periodic credit |  | $ | (14) |  |  | $ | (8) |  |  |  | $ | (29) |  |  | $ | (10) |  |  |  |  |  | $ | (19) |  |  | $ | (30) |  |  |  | $ | (38) |  |  | $ | (60) |  |  |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic credit |  |
Service cost |  | $ | 7 |  |  | $ | 11 |  |  |  | $ | 14 |  |  | $ | 23 |  |  |  |  |  | $ | 3 |  |  | $ | 5 |  |  |  | $ | 6 |  |  | $ | 9 |  |  |
Interest cost |  | 26 |  |  | 20 |  |  |  | 51 |  |  | 36 |  |  |  |  |  | 10 |  |  | 7 |  |  |  | 21 |  |  | 14 |  |  |
Expected return on plan assets |  | (52) |  |  | (50) |  |  |  | (104) |  |  | (99) |  |  |  |  |  | (24) |  |  | (27) |  |  |  | (48) |  |  | (54) |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | 2 |  |  | 9 |  |  |  | 5 |  |  | 25 |  |  |  |  |  | 3 |  |  | — |  |  |  | 6 |  |  | — |  |  |
Prior service cost (credit) |  | 1 |  |  | 1 |  |  |  | 2 |  |  | 2 |  |  |  |  |  | (10) |  |  | (13) |  |  |  | (20) |  |  | (25) |  |  |
Settlement loss |  | 3 |  |  | 2 |  |  |  | 5 |  |  | 4 |  |  |  |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  |
Net periodic credit |  | $ | (13) |  |  | $ | (7) |  |  |  | $ | (27) |  |  | $ | (9) |  |  |  |  |  | $ | (18) |  |  | $ | (28) |  |  |  | $ | (35) |  |  | $ | (56) |  |  |
In Consumers’ 2022 electric rate case, the MPSC approved a mechanism allowing Consumers to defer the future recovery or refund of pension and OPEB expenses above or below the amounts used to set existing rates, respectively, beginning in 2023. At June 30, 2023, CMS Energy, including Consumers, had deferred $6 million of pension credits and $12 million of OPEB costs under this mechanism.

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 No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for retirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//715/tableOfContent Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (o) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (p) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (r)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (r)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480126/715-20-S99-2 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-3 + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock
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: |