Organization and Basis of Presentation (Details Textuals) customer in Millions, $ in Millions	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of electric utility customers \| customer	2.2
Number of gas utility customers \| customer	1.3
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Material potential exposure	$ 0
Amount in excess of carrying amount	80	$ 74
Undistributed earnings from equity method investees	109	$ 129
DTE Electric
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Material potential exposure	$ 0
NEXUS Pipeline
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ownership interest	50.00%
SGG \| Midstream Natural Gas Assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Percentage of voting interests acquired	85.00%

Number of Electric Utility Customers

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- Definition

Number of Gas Utility Customers

+ References

No definition available.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 2
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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees).

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-Section 50
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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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