XML 66 R39.htm IDEA: XBRL DOCUMENT
v3.20.4

Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Financial Instruments [Line Items] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments | For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 6, Fair Value Measurements.
In Millions
| December 31, 2020 |  | December 31, 2019
| 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 |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |  |  |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |
Notes receivable 2 |  | 2,887 |  |  | 3,248 |  |  | — |  |  | — |  |  | 3,248 |  |  |  | 2,500 |  |  | 2,652 |  |  | — |  |  | — |  |  | 2,652 |
Securities held to maturity 3 |  | 28 |  |  | 29 |  |  | — |  |  | 29 |  |  | — |  |  |  | 26 |  |  | 26 |  |  | — |  |  | 26 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 4 |  | 15,120 |  |  | 17,512 |  |  | 1,249 |  |  | 14,178 |  |  | 2,085 |  |  |  | 13,062 |  |  | 14,185 |  |  | 1,197 |  |  | 11,048 |  |  | 1,940 |
Long-term payables 5 |  | 33 |  |  | 35 |  |  | — |  |  | — |  |  | 35 |  |  |  | 30 |  |  | 32 |  |  | — |  |  | — |  |  | 32 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |  |  |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |
Notes receivable – related party 6 |  | 107 |  |  | 107 |  |  | — |  |  | — |  |  | 107 |  |  |  | 103 |  |  | 103 |  |  | — |  |  | — |  |  | 103 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 7 |  | 8,106 |  |  | 9,801 |  |  | — |  |  | 7,716 |  |  | 2,085 |  |  |  | 7,250 |  |  | 8,010 |  |  | — |  |  | 6,070 |  |  | 1,940 |
1 Includes current portion of long-term accounts receivable of $12 million at December 31, 2020 and $13 million at December 31, 2019. 2 Includes current portion of notes receivable of $275 million at December 31, 2020 and $242 million at December 31, 2019. For further details, see Note 8, Notes Receivable. 3 These investment securities consist primarily of mortgage-backed securities and Utah Housing Corporation bonds held by EnerBank. There were $1 million of unrealized gains in 2020 and no unrealized gains or losses in 2019. 4 Includes current portion of long-term debt of $1.5 billion at December 31, 2020 and $1.1 billion at December 31, 2019. 5 Includes current portion of long-term payables of $6 million at December 31, 2020 and $1 million at December 31, 2019. 6 Includes current portion of notes receivable – related party of $7 million at December 31, 2020 and 2019. For further details on this note receivable, see Note 8, Notes Receivable. 7 Includes current portion of long-term debt of $364 million at December 31, 2020 and $202 million at December 31, 2019.
Consumers Energy Company |
Financial Instruments [Line Items] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments | For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 6, Fair Value Measurements.
In Millions
| December 31, 2020 |  | December 31, 2019
| 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 |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |  |  |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |
Notes receivable 2 |  | 2,887 |  |  | 3,248 |  |  | — |  |  | — |  |  | 3,248 |  |  |  | 2,500 |  |  | 2,652 |  |  | — |  |  | — |  |  | 2,652 |
Securities held to maturity 3 |  | 28 |  |  | 29 |  |  | — |  |  | 29 |  |  | — |  |  |  | 26 |  |  | 26 |  |  | — |  |  | 26 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 4 |  | 15,120 |  |  | 17,512 |  |  | 1,249 |  |  | 14,178 |  |  | 2,085 |  |  |  | 13,062 |  |  | 14,185 |  |  | 1,197 |  |  | 11,048 |  |  | 1,940 |
Long-term payables 5 |  | 33 |  |  | 35 |  |  | — |  |  | — |  |  | 35 |  |  |  | 30 |  |  | 32 |  |  | — |  |  | — |  |  | 32 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 17 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |  |  |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |
Notes receivable – related party 6 |  | 107 |  |  | 107 |  |  | — |  |  | — |  |  | 107 |  |  |  | 103 |  |  | 103 |  |  | — |  |  | — |  |  | 103 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 7 |  | 8,106 |  |  | 9,801 |  |  | — |  |  | 7,716 |  |  | 2,085 |  |  |  | 7,250 |  |  | 8,010 |  |  | — |  |  | 6,070 |  |  | 1,940 |
1 Includes current portion of long-term accounts receivable of $12 million at December 31, 2020 and $13 million at December 31, 2019. 2 Includes current portion of notes receivable of $275 million at December 31, 2020 and $242 million at December 31, 2019. For further details, see Note 8, Notes Receivable. 3 These investment securities consist primarily of mortgage-backed securities and Utah Housing Corporation bonds held by EnerBank. There were $1 million of unrealized gains in 2020 and no unrealized gains or losses in 2019. 4 Includes current portion of long-term debt of $1.5 billion at December 31, 2020 and $1.1 billion at December 31, 2019. 5 Includes current portion of long-term payables of $6 million at December 31, 2020 and $1 million at December 31, 2019. 6 Includes current portion of notes receivable – related party of $7 million at December 31, 2020 and 2019. For further details on this note receivable, see Note 8, Notes Receivable. 7 Includes current portion of long-term debt of $364 million at December 31, 2020 and $202 million at December 31, 2019.

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
- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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