Fair Value (Fair Value and Unrealized Gains and Losses for the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 2,007	$ 1,855
Unrealized Gains	572	501
Unrealized Losses	(15)	(7)
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	34	27
Private equity and other
Debt Securities, Available-for-sale [Line Items]
Fair Value	175	104
Unrealized Gains	41	0
Unrealized Losses	(2)	0
Equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,140	1,169
Unrealized Gains	507	481
Unrealized Losses	(8)	(6)
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	658	555
Unrealized Gains	24	20
Unrealized Losses	$ (5)	$ (1)

Decommissioning Fund Investments, Accumulated Gross Unrealized Gain, Before Tax

No definition available.

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- Definition

Decommissioning Fund Investments, Accumulated Gross Unrealized Loss, Before Tax

+ References

No definition available.

+ Details

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- Definition

The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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+ References

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