XML 72 R39.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
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, 2018 |  | December 31, 2017
|  |  | Fair Value |  |  |  | Fair Value
| Carrying |  |  | Level |  | Carrying |  |  | Level
| Amount | Total | 1 | 2 | 3 |  | Amount | Total | 1 | 2 | 3
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 2 |  | 1,857 |  |  | 1,967 |  |  | — |  |  | — |  |  | 1,967 |  |  |  | 1,371 |  |  | 1,464 |  |  | — |  |  | — |  |  | 1,464 |
Securities held to maturity |  | 22 |  |  | 21 |  |  | — |  |  | 21 |  |  | — |  |  |  | 16 |  |  | 16 |  |  | — |  |  | 16 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | 11,589 |  |  | 11,630 |  |  | 459 |  |  | 9,404 |  |  | 1,767 |  |  |  | 10,204 |  |  | 10,715 |  |  | — |  |  | 9,363 |  |  | 1,352 |
Long-term payables 4 |  | 27 |  |  | 27 |  |  | — |  |  | — |  |  | 27 |  |  |  | 27 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 5 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |
Notes receivable – related party 6 |  | 106 |  |  | 106 |  |  | — |  |  | — |  |  | 106 |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 7 |  | 6,805 |  |  | 6,833 |  |  | — |  |  | 5,066 |  |  | 1,767 |  |  |  | 5,904 |  |  | 6,236 |  |  | — |  |  | 4,883 |  |  | 1,353 |
1 | Includes current accounts receivable of $14 million at December 31, 2018 and $14 million at December 31, 2017.
2 | Includes current portion of notes receivable of $233 million at December 31, 2018 and $200 million at December 31, 2017. For further details, see Note 8, Notes Receivable.
3 | Includes current portion of long-term debt of $1.0 billion at December 31, 2018 and $1.1 billion at December 31, 2017.
4 | Includes current portion of long-term payables of $1 million at December 31, 2018 and $3 million at December 31, 2017.
5 | Includes current portion of notes receivable of $17 million at December 31, 2017.
6 | Includes current portion of notes receivable – related party of $7 million at December 31, 2018. For further details on this note receivable, see the DB SERP discussion below.
7 | Includes current portion of long-term debt of $26 million at December 31, 2018 and $343 million at December 31, 2017.
Schedule Of Investment Securities | Presented in the following table are CMS Energy’s and Consumers’ investment securities classified as available for sale or held to maturity:
In Millions |
| December 31, 2018 |  | December 31, 2017
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  |  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP securities |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | — |  |  |  | $ | 141 |  |  | $ | — |  |  | $ | — |  |  | $ | 141 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | 22 |  |  | — |  |  | 1 |  |  | 21 |  |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | 102 |  |  | $ | — |  |  | $ | — |  |  | $ | 102 |
CMS Energy common stock |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 2 |  |  | 19 |  |  | — |  |  | 21 |
Schedule Of Sales Activity For Investment Securities | Presented in the following table is a summary of the sales activity for investment securities held within the DB SERP and classified as available for sale:
In Millions |
Years Ended December 31 | 2018 |  | 2017 |  | 2016 |
CMS Energy, including Consumers |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 142 |  |  | $ | 145 |  |  | $ | 6 |
Consumers |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 103 |  |  | $ | 105 |  |  | $ | 4 |
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, 2018 |  | December 31, 2017
|  |  | Fair Value |  |  |  | Fair Value
| Carrying |  |  | Level |  | Carrying |  |  | Level
| Amount | Total | 1 | 2 | 3 |  | Amount | Total | 1 | 2 | 3
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 2 |  | 1,857 |  |  | 1,967 |  |  | — |  |  | — |  |  | 1,967 |  |  |  | 1,371 |  |  | 1,464 |  |  | — |  |  | — |  |  | 1,464 |
Securities held to maturity |  | 22 |  |  | 21 |  |  | — |  |  | 21 |  |  | — |  |  |  | 16 |  |  | 16 |  |  | — |  |  | 16 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | 11,589 |  |  | 11,630 |  |  | 459 |  |  | 9,404 |  |  | 1,767 |  |  |  | 10,204 |  |  | 10,715 |  |  | — |  |  | 9,363 |  |  | 1,352 |
Long-term payables 4 |  | 27 |  |  | 27 |  |  | — |  |  | — |  |  | 27 |  |  |  | 27 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 5 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |
Notes receivable – related party 6 |  | 106 |  |  | 106 |  |  | — |  |  | — |  |  | 106 |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 7 |  | 6,805 |  |  | 6,833 |  |  | — |  |  | 5,066 |  |  | 1,767 |  |  |  | 5,904 |  |  | 6,236 |  |  | — |  |  | 4,883 |  |  | 1,353 |
1 | Includes current accounts receivable of $14 million at December 31, 2018 and $14 million at December 31, 2017.
2 | Includes current portion of notes receivable of $233 million at December 31, 2018 and $200 million at December 31, 2017. For further details, see Note 8, Notes Receivable.
3 | Includes current portion of long-term debt of $1.0 billion at December 31, 2018 and $1.1 billion at December 31, 2017.
4 | Includes current portion of long-term payables of $1 million at December 31, 2018 and $3 million at December 31, 2017.
5 | Includes current portion of notes receivable of $17 million at December 31, 2017.
6 | Includes current portion of notes receivable – related party of $7 million at December 31, 2018. For further details on this note receivable, see the DB SERP discussion below.
7 | Includes current portion of long-term debt of $26 million at December 31, 2018 and $343 million at December 31, 2017.
Schedule Of Investment Securities | Presented in the following table are CMS Energy’s and Consumers’ investment securities classified as available for sale or held to maturity:
In Millions |
| December 31, 2018 |  | December 31, 2017
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  |  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP securities |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | — |  |  |  | $ | 141 |  |  | $ | — |  |  | $ | — |  |  | $ | 141 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | 22 |  |  | — |  |  | 1 |  |  | 21 |  |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | 102 |  |  | $ | — |  |  | $ | — |  |  | $ | 102 |
CMS Energy common stock |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 2 |  |  | 19 |  |  | — |  |  | 21 |
Schedule Of Sales Activity For Investment Securities | Presented in the following table is a summary of the sales activity for investment securities held within the DB SERP and classified as available for sale:
In Millions |
Years Ended December 31 | 2018 |  | 2017 |  | 2016 |
CMS Energy, including Consumers |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 142 |  |  | $ | 145 |  |  | $ | 6 |
Consumers |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 103 |  |  | $ | 105 |  |  | $ | 4 |

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=109250915&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=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
Name: | us-gaap_ScheduleOfRealizedGainLossTableTextBlock
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: |