XML 51 R29.htm IDEA: XBRL DOCUMENT
v3.21.2

Income Taxes (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
Income Taxes [Line Items] |
Schedule Of Effective Income Tax Rate Reconciliation | Presented in the following table is a reconciliation of the statutory U.S. federal income tax rate to the effective income tax rate from continuing operations:
Six Months Ended June 30 | 2021 |  | 2020 |  |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
U.S. federal income tax rate |  | 21.0 | % |  |  |  | 21.0 | % |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |  |  |  |  |  |  |
State and local income taxes, net of federal effect |  | 5.4 |  |  |  |  | 4.7 |  |  |  |  |
TCJA excess deferred taxes 1 |  | (5.9) |  |  |  |  | (4.3) |  |  |  |  |
Production tax credits |  | (5.1) |  |  |  |  | (3.1) |  |  |  |  |
Accelerated flow-through of regulatory tax benefits 2 |  | (3.3) |  |  |  |  | (1.6) |  |  |  |  |
Research and development tax credits, net 3 |  | (0.3) |  |  |  |  | (2.3) |  |  |  |  |
Refund of alternative minimum tax sequestration 4 |  | — |  |  |  |  | (2.3) |  |  |  |  |
Other, net |  | 0.4 |  |  |  |  | (0.3) |  |  |  |  |
Effective tax rate |  | 12.2 | % |  |  |  | 11.8 | % |  |  |  |
Consumers |  |  |  |  |  |  |  |  |  |
U.S. federal income tax rate |  | 21.0 | % |  |  |  | 21.0 | % |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |  |  |  |  |  |  |
State and local income taxes, net of federal effect |  | 5.2 |  |  |  |  | 5.0 |  |  |  |  |
TCJA excess deferred taxes 1 |  | (4.9) |  |  |  |  | (3.6) |  |  |  |  |
Production tax credits |  | (3.2) |  |  |  |  | (1.6) |  |  |  |  |
Accelerated flow-through of regulatory tax benefits 2 |  | (3.0) |  |  |  |  | (1.6) |  |  |  |  |
Research and development tax credits, net 3 |  | (0.2) |  |  |  |  | (1.9) |  |  |  |  |
Other, net |  | (0.3) |  |  |  |  | (0.5) |  |  |  |  |
Effective tax rate |  | 14.6 | % |  |  |  | 16.8 | % |  |  |  |
1 In September 2020, the MPSC authorized Consumers to accelerate the amortization of a regulatory liability associated with unprotected, non‑property-related excess deferred income taxes resulting from the TCJA. The regulatory liability, which was previously scheduled to be amortized through 2029, will now be fully amortized by the end of 2022. 2 In September 2020, the MPSC authorized Consumers to accelerate the amortization of income tax benefits associated with the cost to remove gas plant assets. These tax benefits, which were previously scheduled to be amortized through 2025, will now be fully amortized by the end of 2022. 3 In March 2020, CMS Energy finalized a study of research and development tax credits for tax years 2012 through 2018. As a result, in 2020, CMS Energy, including Consumers, recognized a $9 million increase in the credit, net of reserves for uncertain tax positions. Of this amount, $8 million was recognized at Consumers. 4 In January 2020, the IRS issued a decision restoring alternative minimum tax credit refunds sequestered in years prior to 2018. As a result, in 2020, CMS Energy recognized a $9 million income tax benefit for sequestered amounts related to its 2017 tax return. CMS Energy received the refund in April 2020.
Consumers Energy Company |
Income Taxes [Line Items] |
Schedule Of Effective Income Tax Rate Reconciliation | Presented in the following table is a reconciliation of the statutory U.S. federal income tax rate to the effective income tax rate from continuing operations:
Six Months Ended June 30 | 2021 |  | 2020 |  |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
U.S. federal income tax rate |  | 21.0 | % |  |  |  | 21.0 | % |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |  |  |  |  |  |  |
State and local income taxes, net of federal effect |  | 5.4 |  |  |  |  | 4.7 |  |  |  |  |
TCJA excess deferred taxes 1 |  | (5.9) |  |  |  |  | (4.3) |  |  |  |  |
Production tax credits |  | (5.1) |  |  |  |  | (3.1) |  |  |  |  |
Accelerated flow-through of regulatory tax benefits 2 |  | (3.3) |  |  |  |  | (1.6) |  |  |  |  |
Research and development tax credits, net 3 |  | (0.3) |  |  |  |  | (2.3) |  |  |  |  |
Refund of alternative minimum tax sequestration 4 |  | — |  |  |  |  | (2.3) |  |  |  |  |
Other, net |  | 0.4 |  |  |  |  | (0.3) |  |  |  |  |
Effective tax rate |  | 12.2 | % |  |  |  | 11.8 | % |  |  |  |
Consumers |  |  |  |  |  |  |  |  |  |
U.S. federal income tax rate |  | 21.0 | % |  |  |  | 21.0 | % |  |  |  |
Increase (decrease) in income taxes from: |  |  |  |  |  |  |  |  |  |
State and local income taxes, net of federal effect |  | 5.2 |  |  |  |  | 5.0 |  |  |  |  |
TCJA excess deferred taxes 1 |  | (4.9) |  |  |  |  | (3.6) |  |  |  |  |
Production tax credits |  | (3.2) |  |  |  |  | (1.6) |  |  |  |  |
Accelerated flow-through of regulatory tax benefits 2 |  | (3.0) |  |  |  |  | (1.6) |  |  |  |  |
Research and development tax credits, net 3 |  | (0.2) |  |  |  |  | (1.9) |  |  |  |  |
Other, net |  | (0.3) |  |  |  |  | (0.5) |  |  |  |  |
Effective tax rate |  | 14.6 | % |  |  |  | 16.8 | % |  |  |  |
1 In September 2020, the MPSC authorized Consumers to accelerate the amortization of a regulatory liability associated with unprotected, non‑property-related excess deferred income taxes resulting from the TCJA. The regulatory liability, which was previously scheduled to be amortized through 2029, will now be fully amortized by the end of 2022. 2 In September 2020, the MPSC authorized Consumers to accelerate the amortization of income tax benefits associated with the cost to remove gas plant assets. These tax benefits, which were previously scheduled to be amortized through 2025, will now be fully amortized by the end of 2022. 3 In March 2020, CMS Energy finalized a study of research and development tax credits for tax years 2012 through 2018. As a result, in 2020, CMS Energy, including Consumers, recognized a $9 million increase in the credit, net of reserves for uncertain tax positions. Of this amount, $8 million was recognized at Consumers. 4 In January 2020, the IRS issued a decision restoring alternative minimum tax credit refunds sequestered in years prior to 2018. As a result, in 2020, CMS Energy recognized a $9 million income tax benefit for sequestered amounts related to its 2017 tax return. CMS Energy received the refund in April 2020.

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

X
- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
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: |