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Earnings Per Share - CMS Energy (Basic And Diluted EPS Computations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income available to common stockholders |  |  |  |
Income from continuing operations | $ 153 | $ 129 | $ 461 | $ 358
Income (loss) attributable to noncontrolling interests | (5) | 1 | (12) | 1
Income from continuing operations available to common stockholders – basic and diluted | $ 158 | $ 128 | $ 473 | $ 357
Average common shares outstanding |  |  |  |
Weighted average shares - basic (in shares) | 289.0 | 285.5 | 288.8 | 284.4
Dilutive nonvested stock awards (in shares) | 0.4 | 0.6 | 0.5 | 0.7
Dilutive forward equity sale contracts | 0.0 | 0.4 | 0.0 | 0.7
Weighted average shares - diluted (in shares) | 289.4 | 286.5 | 289.3 | 285.8
Income from continuing operations per average common share available to common stockholders - Basic (in dollars per share) | $ 0.55 | $ 0.45 | $ 1.64 | $ 1.25
Income from continuing operations per average common share available to common stockholders - Diluted (in dollars per share) | $ 0.55 | $ 0.45 | $ 1.64 | $ 1.25

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256 + Details
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Period Type: | duration

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- References No definition available. + Details
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