Related Party Transactions (DTE Electric Transactions with Affiliated Companies) (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Dividends declared	$ 796,000,000	$ 714,000,000	$ 653,000,000
Dividends paid	760,000,000	692,000,000	620,000,000
DTE Electric
Related Party Transaction [Line Items]
Other services	2,000,000	5,000,000	4,000,000
Dividends declared	539,000,000	494,000,000	461,000,000
Dividends paid	539,000,000	494,000,000	461,000,000
DTE Electric \| Energy sales
Related Party Transaction [Line Items]
Revenues and Other Income	8,000,000	10,000,000	9,000,000
DTE Electric \| Shared capital assets
Related Party Transaction [Line Items]
Revenues and Other Income	51,000,000	47,000,000	43,000,000
DTE Electric \| Fuel and purchased power
Related Party Transaction [Line Items]
Costs	16,000,000	9,000,000	7,000,000
DTE Electric \| Other services and interest
Related Party Transaction [Line Items]
Costs	1,000,000	23,000,000	33,000,000
DTE Electric \| Corporate expenses
Related Party Transaction [Line Items]
Costs	367,000,000	372,000,000	377,000,000
DTE Electric \| DTE Energy
Related Party Transaction [Line Items]
Dividends declared	539,000,000	494,000,000	461,000,000
Dividends paid	539,000,000	494,000,000	461,000,000
Capital contribution from DTE Energy	636,000,000	180,000,000	325,000,000
DTE Electric \| DTE Energy Foundation
Related Party Transaction [Line Items]
Charitable contributions to foundation	$ 20,000,000	$ 0	$ 0

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- Definition

Charitable Contributions To Foundation

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 1
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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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-Publisher FASB
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-Section 45
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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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-Publisher FASB
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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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Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
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