Regulatory Matters (Details Textuals) - USD ($) $ in Millions						3 Months Ended	12 Months Ended
	Feb. 12, 2021	Jul. 17, 2020	May 08, 2020	Nov. 25, 2019	Jul. 08, 2019	Jun. 30, 2020	Dec. 31, 2020	Dec. 09, 2020	Oct. 26, 2020	Jul. 09, 2020	Dec. 31, 2019
Regulatory Assets [Line Items]
Deferral of investigation and remediation of costs associated with gas utilities former MGP sites							10 years
Regulatory liability							$ 3,402				$ 3,329
DTE Gas | MPSC | 2019 Gas Rate Case Filing
Regulatory Assets [Line Items]
Requested rate increase				$ 204
Return on equity, percent		9.90%		10.00%
Return on equity, requested percent				10.50%
Approved rate increase		$ 110
Disallowed cost, capital expenditures related to incentive compensation						$ 14
Regulatory liability for non-plant-related accumulated deferred income tax balances that resulted from the TCJA, accelerated amortization approved		20
Net increase to customers due to rate increase		$ 51
DTE Gas | MPSC | 2021 Gas Rate Case Filing | Subsequent Event
Regulatory Assets [Line Items]
Requested rate increase	$ 195
Return on equity, percent	9.90%
Return on equity, requested percent	10.25%
DTE Gas | COVID-19 Pandemic
Regulatory Assets [Line Items]
Uncollectible expense deferred as a Regulatory asset							2
DTE Electric
Regulatory Assets [Line Items]
Regulatory liability							$ 2,450				$ 2,586
DTE Electric | MPSC | 2019 Electric Rate Case Filing
Regulatory Assets [Line Items]
Requested rate increase					$ 351
Return on equity, percent			9.90%		10.00%
Return on equity, requested percent					10.50%
Approved rate increase			$ 188
Disallowed cost, capital expenditures related to incentive compensation						$ 41
Regulatory liability for non-plant-related accumulated deferred income tax balances that resulted from the TCJA, accelerated amortization approved										$ 102
DTE Electric | COVID-19 Pandemic
Regulatory Assets [Line Items]
Proposed regulatory liability									$ 30
Regulatory liability								$ 30
Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Approved amortization period							5 years
Customer360 deferred costs
Regulatory Assets [Line Items]
Approved amortization period							15 years