XML 40 R18.htm IDEA: XBRL DOCUMENT
v3.21.2

Revenue | 6 Months Ended
--- | ---
Jun. 30, 2021
Disaggregation of Revenue [Line Items] |
Revenue | RevenuePresented in the following tables are the components of operating revenue
In Millions
Three Months Ended June 30, 2021 | Electric Utility | Gas Utility | Enterprises 1 |  | Consolidated
CMS Energy, including Consumers
Consumers utility revenue |  | $ | 1,158 |  |  | $ | 332 |  |  | $ | — |  |  |  |  | $ | 1,490 |
Other |  | — |  |  | — |  |  | 25 |  |  |  |  | 25 |
Revenue recognized from contracts with customers |  | $ | 1,158 |  |  | $ | 332 |  |  | $ | 25 |  |  |  |  | $ | 1,515 |
Leasing income |  | — |  |  | — |  |  | 40 |  |  |  |  | 40 |
Financing income |  | 2 |  |  | 1 |  |  | — |  |  |  |  | 3 |
Total operating revenue – CMS Energy |  | $ | 1,160 |  |  | $ | 333 |  |  | $ | 65 |  |  |  |  | $ | 1,558 |
Consumers
Consumers utility revenue |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 561 |  |  | $ | 220 |  |  |  |  |  |  | $ | 781 |
Commercial |  | 390 |  |  | 59 |  |  |  |  |  |  | 449 |
Industrial |  | 153 |  |  | 8 |  |  |  |  |  |  | 161 |
Other |  | 54 |  |  | 45 |  |  |  |  |  |  | 99 |
Revenue recognized from contracts with customers |  | $ | 1,158 |  |  | $ | 332 |  |  |  |  |  |  | $ | 1,490 |
Financing income |  | 2 |  |  | 1 |  |  |  |  |  |  | 3 |
Total operating revenue – Consumers |  | $ | 1,160 |  |  | $ | 333 |  |  |  |  |  |  | $ | 1,493 |
1 Amounts represent the enterprises segment’s operating revenue from independent power production and its sales of energy commodities. The enterprises segment’s sales of energy commodities are accounted for as operating leases. In addition to fixed payments, these agreements have variable payments based on energy delivered. The enterprises segment’s leasing income included variable lease payments of $26 million for the three months ended June 30, 2021.
In Millions
Three Months Ended June 30, 2020 | Electric Utility | Gas Utility | Enterprises 1 |  | Consolidated
CMS Energy, including Consumers
Consumers utility revenue |  | $ | 1,020 |  |  | $ | 306 |  |  | $ | — |  |  |  |  | $ | 1,326 |
Other |  | — |  |  | — |  |  | 17 |  |  |  |  | 17 |
Revenue recognized from contracts with customers |  | $ | 1,020 |  |  | $ | 306 |  |  | $ | 17 |  |  |  |  | $ | 1,343 |
Leasing income |  | — |  |  | — |  |  | 35 |  |  |  |  | 35 |
Financing income |  | 2 |  |  | 2 |  |  | — |  |  |  |  | 4 |
Total operating revenue – CMS Energy |  | $ | 1,022 |  |  | $ | 308 |  |  | $ | 52 |  |  |  |  | $ | 1,382 |
Consumers
Consumers utility revenue |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 507 |  |  | $ | 206 |  |  |  |  |  |  | $ | 713 |
Commercial |  | 341 |  |  | 51 |  |  |  |  |  |  | 392 |
Industrial |  | 126 |  |  | 7 |  |  |  |  |  |  | 133 |
Other |  | 46 |  |  | 42 |  |  |  |  |  |  | 88 |
Revenue recognized from contracts with customers |  | $ | 1,020 |  |  | $ | 306 |  |  |  |  |  |  | $ | 1,326 |
Financing income |  | 2 |  |  | 2 |  |  |  |  |  |  | 4 |
Total operating revenue – Consumers |  | $ | 1,022 |  |  | $ | 308 |  |  |  |  |  |  | $ | 1,330 |
1 Amounts represent the enterprises segment’s operating revenue from independent power production and its sales of energy commodities. The enterprises segment’s sales of energy commodities are accounted for as operating leases. In addition to fixed payments, these agreements have variable payments based on energy delivered. The enterprises segment’s leasing income included variable lease payments of $21 million for the three months ended June 30, 2020.
In Millions
Six Months Ended June 30, 2021 | Electric Utility | Gas Utility | Enterprises 1 |  | Consolidated
CMS Energy, including Consumers
Consumers utility revenue |  | $ | 2,289 |  |  | $ | 1,133 |  |  | $ | — |  |  |  |  | $ | 3,422 |
Other |  | — |  |  | — |  |  | 55 |  |  |  |  | 55 |
Revenue recognized from contracts with customers |  | $ | 2,289 |  |  | $ | 1,133 |  |  | $ | 55 |  |  |  |  | $ | 3,477 |
Leasing income |  | — |  |  | — |  |  | 86 |  |  |  |  | 86 |
Financing income |  | 5 |  |  | 3 |  |  | — |  |  |  |  | 8 |
Total operating revenue – CMS Energy |  | $ | 2,294 |  |  | $ | 1,136 |  |  | $ | 141 |  |  |  |  | $ | 3,571 |
Consumers
Consumers utility revenue |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 1,129 |  |  | $ | 774 |  |  |  |  |  |  | $ | 1,903 |
Commercial |  | 735 |  |  | 222 |  |  |  |  |  |  | 957 |
Industrial |  | 291 |  |  | 31 |  |  |  |  |  |  | 322 |
Other |  | 134 |  |  | 106 |  |  |  |  |  |  | 240 |
Revenue recognized from contracts with customers |  | $ | 2,289 |  |  | $ | 1,133 |  |  |  |  |  |  | $ | 3,422 |
Financing income |  | 5 |  |  | 3 |  |  |  |  |  |  | 8 |
Total operating revenue – Consumers |  | $ | 2,294 |  |  | $ | 1,136 |  |  |  |  |  |  | $ | 3,430 |
1 Amounts represent the enterprises segment’s operating revenue from independent power production and its sales of energy commodities. The enterprises segment’s sales of energy commodities are accounted for as operating leases. In addition to fixed payments, these agreements have variable payments based on energy delivered. The enterprises segment’s leasing income included variable lease payments of $59 million for the six months ended June 30, 2021.
In Millions
Six Months Ended June 30, 2020 | Electric Utility | Gas Utility | Enterprises 1 |  | Consolidated
CMS Energy, including Consumers
Consumers utility revenue |  | $ | 2,045 |  |  | $ | 1,020 |  |  | $ | — |  |  |  |  | $ | 3,065 |
Other |  | — |  |  | — |  |  | 36 |  |  |  |  | 36 |
Revenue recognized from contracts with customers |  | $ | 2,045 |  |  | $ | 1,020 |  |  | $ | 36 |  |  |  |  | $ | 3,101 |
Leasing income |  | — |  |  | — |  |  | 74 |  |  |  |  | 74 |
Financing income |  | 5 |  |  | 4 |  |  | — |  |  |  |  | 9 |
Total operating revenue – CMS Energy |  | $ | 2,050 |  |  | $ | 1,024 |  |  | $ | 110 |  |  |  |  | $ | 3,184 |
Consumers
Consumers utility revenue |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 988 |  |  | $ | 699 |  |  |  |  |  |  | $ | 1,687 |
Commercial |  | 680 |  |  | 200 |  |  |  |  |  |  | 880 |
Industrial |  | 266 |  |  | 27 |  |  |  |  |  |  | 293 |
Other |  | 111 |  |  | 94 |  |  |  |  |  |  | 205 |
Revenue recognized from contracts with customers |  | $ | 2,045 |  |  | $ | 1,020 |  |  |  |  |  |  | $ | 3,065 |
Financing income |  | 5 |  |  | 4 |  |  |  |  |  |  | 9 |
Total operating revenue – Consumers |  | $ | 2,050 |  |  | $ | 1,024 |  |  |  |  |  |  | $ | 3,074 |
1 Amounts represent the enterprises segment’s operating revenue from independent power production and its sales of energy commodities. The enterprises segment’s sales of energy commodities are accounted for as operating leases. In addition to fixed payments, these agreements have variable payments based on energy delivered. The enterprises segment’s leasing income included variable lease payments of $46 million for the six months ended June 30, 2020. Electric and Gas Utilities Consumers Utility Revenue: Consumers recognizes revenue primarily from the sale of electric and gas utility services at tariff-based rates regulated by the MPSC. Consumers’ customer base consists of a mix of residential, commercial, and diversified industrial customers. Consumers’ tariff-based sales performance obligations are described below. •Consumers has performance obligations for the service of standing ready to deliver electricity or natural gas to customers, and it satisfies these performance obligations over time. Consumers recognizes revenue at a fixed rate as it provides these services. These arrangements generally do not have fixed terms and remain in effect as long as the customer consumes the utility service. The rates are set by the MPSC through the rate-making process and represent the stand-alone selling price of Consumers’ service to stand ready to deliver. •Consumers has performance obligations for the service of delivering the commodity of electricity or natural gas to customers, and it satisfies these performance obligations upon delivery. Consumers recognizes revenue at a price per unit of electricity or natural gas delivered, based on the tariffs established by the MPSC. These arrangements generally do not have fixed terms and remain in effect as long as the customer consumes the utility service. The rates are set by the MPSC through the rate-making process and represent the stand-alone selling price of a bundled product comprising the commodity, electricity or natural gas, and the service of delivering such commodity. In some instances, Consumers has specific fixed-term contracts with large commercial and industrial customers to provide electricity or gas at certain tariff rates or to provide gas transportation services at contracted rates. The amount of electricity and gas to be delivered under these contracts and the associated future revenue to be received are generally dependent on the customers’ needs. Accordingly, Consumers recognizes revenues at the tariff or contracted rate as electricity or gas is delivered to the customer. Consumers also has other miscellaneous contracts with customers related to pole and other property rentals, appliance service plans, and utility contract work. Generally, these contracts are short term or evergreen in nature. Accounts Receivable and Unbilled Revenues: Accounts receivable comprise trade receivables and unbilled receivables. CMS Energy and Consumers record their accounts receivable at cost less an allowance for uncollectible accounts. The allowance is increased for uncollectible accounts expense and decreased for account write-offs net of recoveries. CMS Energy and Consumers establish the allowance based on historical losses, management’s assessment of existing economic conditions, customer payment trends, and reasonable and supported forecast information. CMS Energy and Consumers assess late payment fees on trade receivables based on contractual past-due terms established with customers. Accounts are written off when deemed uncollectible, which is generally when they become six months past due. CMS Energy and Consumers recorded uncollectible accounts expense of $5 million for the three months ended June 30, 2021 and $8 million for the three months ended June 30, 2020. CMS Energy and Consumers recorded uncollectible accounts expense of $11 million for the six months ended June 30, 2021 and $13 million for the six months ended June 30, 2020. Consumers’ customers are billed monthly in cycles having billing dates that do not generally coincide with the end of a calendar month. This results in customers having received electricity or natural gas that they have not been billed for as of the month-end. Consumers estimates its unbilled revenues by applying an average billed rate to total unbilled deliveries for each customer class. Unbilled revenues, which are recorded as accounts receivable and accrued revenue on CMS Energy’s and Consumers’ consolidated balance sheets, were $361 million at June 30, 2021 and $437 million at December 31, 2020.
Consumers Energy Company |
Disaggregation of Revenue [Line Items] |
Revenue | RevenuePresented in the following tables are the components of operating revenue
In Millions
Three Months Ended June 30, 2021 | Electric Utility | Gas Utility | Enterprises 1 |  | Consolidated
CMS Energy, including Consumers
Consumers utility revenue |  | $ | 1,158 |  |  | $ | 332 |  |  | $ | — |  |  |  |  | $ | 1,490 |
Other |  | — |  |  | — |  |  | 25 |  |  |  |  | 25 |
Revenue recognized from contracts with customers |  | $ | 1,158 |  |  | $ | 332 |  |  | $ | 25 |  |  |  |  | $ | 1,515 |
Leasing income |  | — |  |  | — |  |  | 40 |  |  |  |  | 40 |
Financing income |  | 2 |  |  | 1 |  |  | — |  |  |  |  | 3 |
Total operating revenue – CMS Energy |  | $ | 1,160 |  |  | $ | 333 |  |  | $ | 65 |  |  |  |  | $ | 1,558 |
Consumers
Consumers utility revenue |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 561 |  |  | $ | 220 |  |  |  |  |  |  | $ | 781 |
Commercial |  | 390 |  |  | 59 |  |  |  |  |  |  | 449 |
Industrial |  | 153 |  |  | 8 |  |  |  |  |  |  | 161 |
Other |  | 54 |  |  | 45 |  |  |  |  |  |  | 99 |
Revenue recognized from contracts with customers |  | $ | 1,158 |  |  | $ | 332 |  |  |  |  |  |  | $ | 1,490 |
Financing income |  | 2 |  |  | 1 |  |  |  |  |  |  | 3 |
Total operating revenue – Consumers |  | $ | 1,160 |  |  | $ | 333 |  |  |  |  |  |  | $ | 1,493 |
1 Amounts represent the enterprises segment’s operating revenue from independent power production and its sales of energy commodities. The enterprises segment’s sales of energy commodities are accounted for as operating leases. In addition to fixed payments, these agreements have variable payments based on energy delivered. The enterprises segment’s leasing income included variable lease payments of $26 million for the three months ended June 30, 2021.
In Millions
Three Months Ended June 30, 2020 | Electric Utility | Gas Utility | Enterprises 1 |  | Consolidated
CMS Energy, including Consumers
Consumers utility revenue |  | $ | 1,020 |  |  | $ | 306 |  |  | $ | — |  |  |  |  | $ | 1,326 |
Other |  | — |  |  | — |  |  | 17 |  |  |  |  | 17 |
Revenue recognized from contracts with customers |  | $ | 1,020 |  |  | $ | 306 |  |  | $ | 17 |  |  |  |  | $ | 1,343 |
Leasing income |  | — |  |  | — |  |  | 35 |  |  |  |  | 35 |
Financing income |  | 2 |  |  | 2 |  |  | — |  |  |  |  | 4 |
Total operating revenue – CMS Energy |  | $ | 1,022 |  |  | $ | 308 |  |  | $ | 52 |  |  |  |  | $ | 1,382 |
Consumers
Consumers utility revenue |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 507 |  |  | $ | 206 |  |  |  |  |  |  | $ | 713 |
Commercial |  | 341 |  |  | 51 |  |  |  |  |  |  | 392 |
Industrial |  | 126 |  |  | 7 |  |  |  |  |  |  | 133 |
Other |  | 46 |  |  | 42 |  |  |  |  |  |  | 88 |
Revenue recognized from contracts with customers |  | $ | 1,020 |  |  | $ | 306 |  |  |  |  |  |  | $ | 1,326 |
Financing income |  | 2 |  |  | 2 |  |  |  |  |  |  | 4 |
Total operating revenue – Consumers |  | $ | 1,022 |  |  | $ | 308 |  |  |  |  |  |  | $ | 1,330 |
1 Amounts represent the enterprises segment’s operating revenue from independent power production and its sales of energy commodities. The enterprises segment’s sales of energy commodities are accounted for as operating leases. In addition to fixed payments, these agreements have variable payments based on energy delivered. The enterprises segment’s leasing income included variable lease payments of $21 million for the three months ended June 30, 2020.
In Millions
Six Months Ended June 30, 2021 | Electric Utility | Gas Utility | Enterprises 1 |  | Consolidated
CMS Energy, including Consumers
Consumers utility revenue |  | $ | 2,289 |  |  | $ | 1,133 |  |  | $ | — |  |  |  |  | $ | 3,422 |
Other |  | — |  |  | — |  |  | 55 |  |  |  |  | 55 |
Revenue recognized from contracts with customers |  | $ | 2,289 |  |  | $ | 1,133 |  |  | $ | 55 |  |  |  |  | $ | 3,477 |
Leasing income |  | — |  |  | — |  |  | 86 |  |  |  |  | 86 |
Financing income |  | 5 |  |  | 3 |  |  | — |  |  |  |  | 8 |
Total operating revenue – CMS Energy |  | $ | 2,294 |  |  | $ | 1,136 |  |  | $ | 141 |  |  |  |  | $ | 3,571 |
Consumers
Consumers utility revenue |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 1,129 |  |  | $ | 774 |  |  |  |  |  |  | $ | 1,903 |
Commercial |  | 735 |  |  | 222 |  |  |  |  |  |  | 957 |
Industrial |  | 291 |  |  | 31 |  |  |  |  |  |  | 322 |
Other |  | 134 |  |  | 106 |  |  |  |  |  |  | 240 |
Revenue recognized from contracts with customers |  | $ | 2,289 |  |  | $ | 1,133 |  |  |  |  |  |  | $ | 3,422 |
Financing income |  | 5 |  |  | 3 |  |  |  |  |  |  | 8 |
Total operating revenue – Consumers |  | $ | 2,294 |  |  | $ | 1,136 |  |  |  |  |  |  | $ | 3,430 |
1 Amounts represent the enterprises segment’s operating revenue from independent power production and its sales of energy commodities. The enterprises segment’s sales of energy commodities are accounted for as operating leases. In addition to fixed payments, these agreements have variable payments based on energy delivered. The enterprises segment’s leasing income included variable lease payments of $59 million for the six months ended June 30, 2021.
In Millions
Six Months Ended June 30, 2020 | Electric Utility | Gas Utility | Enterprises 1 |  | Consolidated
CMS Energy, including Consumers
Consumers utility revenue |  | $ | 2,045 |  |  | $ | 1,020 |  |  | $ | — |  |  |  |  | $ | 3,065 |
Other |  | — |  |  | — |  |  | 36 |  |  |  |  | 36 |
Revenue recognized from contracts with customers |  | $ | 2,045 |  |  | $ | 1,020 |  |  | $ | 36 |  |  |  |  | $ | 3,101 |
Leasing income |  | — |  |  | — |  |  | 74 |  |  |  |  | 74 |
Financing income |  | 5 |  |  | 4 |  |  | — |  |  |  |  | 9 |
Total operating revenue – CMS Energy |  | $ | 2,050 |  |  | $ | 1,024 |  |  | $ | 110 |  |  |  |  | $ | 3,184 |
Consumers
Consumers utility revenue |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 988 |  |  | $ | 699 |  |  |  |  |  |  | $ | 1,687 |
Commercial |  | 680 |  |  | 200 |  |  |  |  |  |  | 880 |
Industrial |  | 266 |  |  | 27 |  |  |  |  |  |  | 293 |
Other |  | 111 |  |  | 94 |  |  |  |  |  |  | 205 |
Revenue recognized from contracts with customers |  | $ | 2,045 |  |  | $ | 1,020 |  |  |  |  |  |  | $ | 3,065 |
Financing income |  | 5 |  |  | 4 |  |  |  |  |  |  | 9 |
Total operating revenue – Consumers |  | $ | 2,050 |  |  | $ | 1,024 |  |  |  |  |  |  | $ | 3,074 |
1 Amounts represent the enterprises segment’s operating revenue from independent power production and its sales of energy commodities. The enterprises segment’s sales of energy commodities are accounted for as operating leases. In addition to fixed payments, these agreements have variable payments based on energy delivered. The enterprises segment’s leasing income included variable lease payments of $46 million for the six months ended June 30, 2020. Electric and Gas Utilities Consumers Utility Revenue: Consumers recognizes revenue primarily from the sale of electric and gas utility services at tariff-based rates regulated by the MPSC. Consumers’ customer base consists of a mix of residential, commercial, and diversified industrial customers. Consumers’ tariff-based sales performance obligations are described below. •Consumers has performance obligations for the service of standing ready to deliver electricity or natural gas to customers, and it satisfies these performance obligations over time. Consumers recognizes revenue at a fixed rate as it provides these services. These arrangements generally do not have fixed terms and remain in effect as long as the customer consumes the utility service. The rates are set by the MPSC through the rate-making process and represent the stand-alone selling price of Consumers’ service to stand ready to deliver. •Consumers has performance obligations for the service of delivering the commodity of electricity or natural gas to customers, and it satisfies these performance obligations upon delivery. Consumers recognizes revenue at a price per unit of electricity or natural gas delivered, based on the tariffs established by the MPSC. These arrangements generally do not have fixed terms and remain in effect as long as the customer consumes the utility service. The rates are set by the MPSC through the rate-making process and represent the stand-alone selling price of a bundled product comprising the commodity, electricity or natural gas, and the service of delivering such commodity. In some instances, Consumers has specific fixed-term contracts with large commercial and industrial customers to provide electricity or gas at certain tariff rates or to provide gas transportation services at contracted rates. The amount of electricity and gas to be delivered under these contracts and the associated future revenue to be received are generally dependent on the customers’ needs. Accordingly, Consumers recognizes revenues at the tariff or contracted rate as electricity or gas is delivered to the customer. Consumers also has other miscellaneous contracts with customers related to pole and other property rentals, appliance service plans, and utility contract work. Generally, these contracts are short term or evergreen in nature. Accounts Receivable and Unbilled Revenues: Accounts receivable comprise trade receivables and unbilled receivables. CMS Energy and Consumers record their accounts receivable at cost less an allowance for uncollectible accounts. The allowance is increased for uncollectible accounts expense and decreased for account write-offs net of recoveries. CMS Energy and Consumers establish the allowance based on historical losses, management’s assessment of existing economic conditions, customer payment trends, and reasonable and supported forecast information. CMS Energy and Consumers assess late payment fees on trade receivables based on contractual past-due terms established with customers. Accounts are written off when deemed uncollectible, which is generally when they become six months past due. CMS Energy and Consumers recorded uncollectible accounts expense of $5 million for the three months ended June 30, 2021 and $8 million for the three months ended June 30, 2020. CMS Energy and Consumers recorded uncollectible accounts expense of $11 million for the six months ended June 30, 2021 and $13 million for the six months ended June 30, 2020. Consumers’ customers are billed monthly in cycles having billing dates that do not generally coincide with the end of a calendar month. This results in customers having received electricity or natural gas that they have not been billed for as of the month-end. Consumers estimates its unbilled revenues by applying an average billed rate to total unbilled deliveries for each customer class. Unbilled revenues, which are recorded as accounts receivable and accrued revenue on CMS Energy’s and Consumers’ consolidated balance sheets, were $361 million at June 30, 2021 and $437 million at December 31, 2020.

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_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerTextBlock
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: |