Fair Value (Fair Value and Unrealized Gains and Losses for the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 2,010	$ 2,071
Unrealized Gains	570	628
Unrealized Losses	(49)	(25)
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	37	39
Unrealized Gains	0	0
Unrealized Losses	0	0
Private equity and other
Debt Securities, Available-for-sale [Line Items]
Fair Value	236	205
Unrealized Gains	70	58
Unrealized Losses	(2)	(8)
Hedge funds and similar investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	95	76
Unrealized Gains	1	1
Unrealized Losses	(4)	(2)
Equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,033	1,107
Unrealized Gains	488	546
Unrealized Losses	(13)	(9)
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	609	644
Unrealized Gains	11	23
Unrealized Losses	$ (30)	$ (6)

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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