Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
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-Subparagraph (b)
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Long-Term Financings (Debt Redemptions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument, Redemption [Line Items]
Amount	$ 1,291	$ 2,139	$ 1,616
Senior Notes \| Senior Notes 1.05% Due 2025
Debt Instrument, Redemption [Line Items]
Interest Rate	1.05%
Amount	$ 800
DTE Electric
Debt Instrument, Redemption [Line Items]
Amount	$ 421	$ 164	$ 541
DTE Electric \| Mortgage Bonds \| Mortgage Bonds 3.38% Due 2025
Debt Instrument, Redemption [Line Items]
Interest Rate	3.38%
Amount	$ 350
DTE Electric \| Securitization Bonds \| Securitization Bonds 5.97% Due 2025
Debt Instrument, Redemption [Line Items]
Interest Rate	5.97%
Amount	$ 15
DTE Electric \| Securitization Bonds \| Securitization Bonds 2.64% Due 2025
Debt Instrument, Redemption [Line Items]
Interest Rate	2.64%
Amount	$ 20
DTE Electric \| Securitization Bonds \| Securitization Bonds 2.64% Due December 2025
Debt Instrument, Redemption [Line Items]
Interest Rate	2.64%
Amount	$ 21
DTE Gas \| Mortgage Bonds \| Mortgage Bonds 3.74% Due 2025
Debt Instrument, Redemption [Line Items]
Interest Rate	3.74%
Amount	$ 70