XML 29 R13.htm IDEA: XBRL DOCUMENT
v3.21.1

Financial Instruments | 3 Months Ended
--- | ---
Mar. 31, 2021
Financial Instruments [Line Items] |
Financial Instruments | Financial Instruments Presented in the following table are the carrying amounts and fair values, by level within the fair value hierarchy, of CMS Energy’s and Consumers’ financial instruments that are not recorded at fair value. The table excludes cash, cash equivalents, short-term financial instruments, and trade accounts receivable and payable whose carrying amounts approximate their fair values. For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 4, Fair Value Measurements.
In Millions
| March 31, 2021 |  | December 31, 2020
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
| Total | Level |  | Total | Level
| 1 | 2 | 3 |  | 1 | 2 | 3
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 16 |  |  | $ | 16 |  |  | $ | — |  |  | $ | — |  |  | $ | 16 |  |  |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |
Notes receivable 2 |  | 2,710 |  |  | 3,006 |  |  | — |  |  | — |  |  | 3,006 |  |  |  | 2,887 |  |  | 3,248 |  |  | — |  |  | — |  |  | 3,248 |
Securities held to maturity 3 |  | 34 |  |  | 34 |  |  | — |  |  | 34 |  |  | — |  |  |  | 28 |  |  | 29 |  |  | — |  |  | 29 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 4 |  | 15,046 |  |  | 16,233 |  |  | 1,206 |  |  | 13,108 |  |  | 1,919 |  |  |  | 15,120 |  |  | 17,512 |  |  | 1,249 |  |  | 14,178 |  |  | 2,085 |
Long-term payables 5 |  | 33 |  |  | 35 |  |  | — |  |  | — |  |  | 35 |  |  |  | 33 |  |  | 35 |  |  | — |  |  | — |  |  | 35 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 16 |  |  | $ | 16 |  |  | $ | — |  |  | $ | — |  |  | $ | 16 |  |  |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |
Notes receivable – related party 6 |  | 106 |  |  | 106 |  |  | — |  |  | — |  |  | 106 |  |  |  | 107 |  |  | 107 |  |  | — |  |  | — |  |  | 107 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 7 |  | 8,107 |  |  | 8,815 |  |  | — |  |  | 6,896 |  |  | 1,919 |  |  |  | 8,106 |  |  | 9,801 |  |  | — |  |  | 7,716 |  |  | 2,085 |
1 Includes current portion of long-term accounts receivable of $11 million at March 31, 2021 and $12 million at December 31, 2020. 2 Includes current portion of notes receivable of $284 million at March 31, 2021 and $275 million at December 31, 2020. For further details, see Note 6, Notes Receivable. 3 These investment securities consist primarily of mortgage-backed securities and Utah Housing Corporation bonds held by EnerBank. There were no unrealized gains during the three months ended March 31, 2021 and $1 million of unrealized gains during the year ended December 31, 2020. 4 Includes current portion of long-term debt of $1.5 billion at March 31, 2021 and December 31, 2020. 5 Includes current portion of long-term payables of $6 million at March 31, 2021 and December 31, 2020. 6 Includes current portion of notes receivable – related party of $7 million at March 31, 2021 and December 31, 2020. For further details on this note receivable, see Note 6, Notes Receivable. 7 Includes current portion of long-term debt of $364 million at March 31, 2021 and December 31, 2020.
Consumers Energy Company |
Financial Instruments [Line Items] |
Financial Instruments | Financial Instruments Presented in the following table are the carrying amounts and fair values, by level within the fair value hierarchy, of CMS Energy’s and Consumers’ financial instruments that are not recorded at fair value. The table excludes cash, cash equivalents, short-term financial instruments, and trade accounts receivable and payable whose carrying amounts approximate their fair values. For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 4, Fair Value Measurements.
In Millions
| March 31, 2021 |  | December 31, 2020
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
| Total | Level |  | Total | Level
| 1 | 2 | 3 |  | 1 | 2 | 3
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 16 |  |  | $ | 16 |  |  | $ | — |  |  | $ | — |  |  | $ | 16 |  |  |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |
Notes receivable 2 |  | 2,710 |  |  | 3,006 |  |  | — |  |  | — |  |  | 3,006 |  |  |  | 2,887 |  |  | 3,248 |  |  | — |  |  | — |  |  | 3,248 |
Securities held to maturity 3 |  | 34 |  |  | 34 |  |  | — |  |  | 34 |  |  | — |  |  |  | 28 |  |  | 29 |  |  | — |  |  | 29 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 4 |  | 15,046 |  |  | 16,233 |  |  | 1,206 |  |  | 13,108 |  |  | 1,919 |  |  |  | 15,120 |  |  | 17,512 |  |  | 1,249 |  |  | 14,178 |  |  | 2,085 |
Long-term payables 5 |  | 33 |  |  | 35 |  |  | — |  |  | — |  |  | 35 |  |  |  | 33 |  |  | 35 |  |  | — |  |  | — |  |  | 35 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 16 |  |  | $ | 16 |  |  | $ | — |  |  | $ | — |  |  | $ | 16 |  |  |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |
Notes receivable – related party 6 |  | 106 |  |  | 106 |  |  | — |  |  | — |  |  | 106 |  |  |  | 107 |  |  | 107 |  |  | — |  |  | — |  |  | 107 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 7 |  | 8,107 |  |  | 8,815 |  |  | — |  |  | 6,896 |  |  | 1,919 |  |  |  | 8,106 |  |  | 9,801 |  |  | — |  |  | 7,716 |  |  | 2,085 |
1 Includes current portion of long-term accounts receivable of $11 million at March 31, 2021 and $12 million at December 31, 2020. 2 Includes current portion of notes receivable of $284 million at March 31, 2021 and $275 million at December 31, 2020. For further details, see Note 6, Notes Receivable. 3 These investment securities consist primarily of mortgage-backed securities and Utah Housing Corporation bonds held by EnerBank. There were no unrealized gains during the three months ended March 31, 2021 and $1 million of unrealized gains during the year ended December 31, 2020. 4 Includes current portion of long-term debt of $1.5 billion at March 31, 2021 and December 31, 2020. 5 Includes current portion of long-term payables of $6 million at March 31, 2021 and December 31, 2020. 6 Includes current portion of notes receivable – related party of $7 million at March 31, 2021 and December 31, 2020. For further details on this note receivable, see Note 6, Notes Receivable. 7 Includes current portion of long-term debt of $364 million at March 31, 2021 and December 31, 2020.

X
- Definition The entire disclosure of the fair value of financial instruments and investments in debt and equity securities. + References No definition available. + Details
Name: | cms_FairValueOfFinancialInstrumentsAndInvestmentsInDebtAndEquitySecuritiesTextBlockTextBlock
Namespace Prefix: | cms_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financial Instruments [Line Items] + References No definition available. + Details
Name: | cms_FinancialInstrumentsLineItems
Namespace Prefix: | cms_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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