Long-Term Debt (Debt Redemptions) (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
Debt Instrument, Redemption [Line Items]
Amount	$ 385
DTE Energy \| Secured Note \| 7.29% Secured Note due 2029
Debt Instrument, Redemption [Line Items]
Interest Rate	7.29%
Amount	$ 77
DTE Energy \| Other Long-Term Debt
Debt Instrument, Redemption [Line Items]
Amount	8
DTE Energy \| Other Long-Term Debt \| Gas Storage and Pipelines
Debt Instrument, Redemption [Line Items]
Net loss on extinguishment of debt	16
Loss related to early redemption premiums	20
Unamortized debt premiums	$ 4
DTE Electric \| Senior Notes \| 5.60% Senior Notes Due 2018
Debt Instrument, Redemption [Line Items]
Interest Rate	5.60%
Amount	$ 300

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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