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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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)
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Long-Term Debt (Debt Redemptions) (Details) - USD ($) $ in Millions	1 Months Ended				12 Months Ended
	Oct. 31, 2020	Sep. 30, 2020	Jul. 31, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument, Redemption [Line Items]
Amount					$ 882	$ 821	$ 105
Junior Subordinated Debentures \| Series C, 2012, 5.25% Junior Subordinated Debentures Maturing 2062
Debt Instrument, Redemption [Line Items]
Interest Rate	5.25%				5.25%
Amount	$ 200
DTE Electric
Debt Instrument, Redemption [Line Items]
Amount					$ 632	$ 0	$ 0
DTE Electric \| Senior Notes \| 4.89% Senior Notes Maturing 2020
Debt Instrument, Redemption [Line Items]
Interest Rate				4.89%	4.89%
Amount				$ 300
DTE Electric \| Senior Notes \| 5.63% Senior Notes Maturing 2020
Debt Instrument, Redemption [Line Items]
Interest Rate			5.63%
Amount			$ 32
DTE Electric \| Senior Notes \| 2010 Series B 3.45% Senior Notes Maturing 2020
Debt Instrument, Redemption [Line Items]
Interest Rate			3.45%		3.45%
Amount			$ 300
DTE Gas \| Senior Notes \| 2008 Series I 6.36% Senior Notes Maturing 2020
Debt Instrument, Redemption [Line Items]
Interest Rate		6.36%			6.36%
Amount		$ 50