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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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+ References

No definition available.

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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Long-Term Debt (Details Textuals) - USD ($) $ in Millions		3 Months Ended
Long-Term Debt (Details Textuals) - USD ($) $ in Millions	Apr. 23, 2021	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Debt redeemed		$ 0	$ 300
DTE Electric
Debt Instrument [Line Items]
Debt redeemed		$ 0	$ 300
2011 Series B 3.90% General and Refunding Mortgage Bonds \| Mortgage Bonds \| DTE Electric \| Subsequent Event
Debt Instrument [Line Items]
Debt redeemed	$ 250
Interest rate	3.90%