Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Significant Accounting Policies [Line Items]
Reclassification of income tax effects	$ 12,488	$ 11,892	$ 10,904	$ 12,488	$ 10,904	$ 11,836	$ 10,717	$ 11,988	$ 10,569	$ 11,020
Implementation of ASU						us-gaap:AccountingStandardsUpdate201802Member	us-gaap:AccountingStandardsUpdate201802Member
Effective tax rate increase (decrease)	(1.00%)			(2.00%)
Amortization of TCJA regulatory liability	2.00%			2.00%
Annual production tax credit increase (decrease)	(1.00%)			(3.00%)
Carryback of 2018 net operating loss due to the CARES Act				3.00%
Unrecognized compensation cost	$ 84			$ 84
Recognition period (in years)				1 year 4 months 28 days
Uncollectible expense adjusted for regulatory deferrals	22		28	$ 70	81
CARES Act
Significant Accounting Policies [Line Items]
Reduction in Income Tax Expense due to carryback of 2018 net operating loss to 2013				34
Claim for employee retention credits		6
Deferral of employer payroll taxes				$ 32
CARES Act, AMT Credit Refund
Significant Accounting Policies [Line Items]
AMT credit received from U.S. Treasury	220
Immediate Refund of 2018 Remaining AMT Credit Balance
Significant Accounting Policies [Line Items]
AMT credit received from U.S. Treasury	153
Immediate Refund of AMT Credit Generated by Carrying Back 2018 Net Operating Loss to 2013
Significant Accounting Policies [Line Items]
AMT credit received from U.S. Treasury	$ 67
Minimum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period				60 days
Maximum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period				120 days
Unbilled Revenues
Significant Accounting Policies [Line Items]
Specific review of probable future collections based on receivable balances, threshold duration				30 days
DTE Electric and DTE Gas
Significant Accounting Policies [Line Items]
Receivables due date				21 days
Threshold period past due for write-off of trade accounts receivable				150 days
DTE Electric
Significant Accounting Policies [Line Items]
Effective tax rate increase (decrease)	(3.00%)			(4.00%)
Amortization of TCJA regulatory liability	3.00%			3.00%
Annual production tax credit increase (decrease)				1.00%
Uncollectible expense adjusted for regulatory deferrals	$ 16		17	$ 42	47
DTE Electric | COVID-19 Pandemic
Significant Accounting Policies [Line Items]
Uncollectible expense deferred as a Regulatory asset	(1)			5
DTE Electric | CARES Act
Significant Accounting Policies [Line Items]
Claim for employee retention credits		3
Deferral of employer payroll taxes				17
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Income tax payable	5			5
Income tax receivable						$ 14
Allocated costs	12		9	28	33
DTE Gas | COVID-19 Pandemic
Significant Accounting Policies [Line Items]
Uncollectible expense deferred as a Regulatory asset	(1)			1
Accumulated Other Comprehensive Income (Loss)
Significant Accounting Policies [Line Items]
Reclassification of income tax effects	(138)	(141)	(146)	(138)	(146)	(148)	$ (120)	(145)	(146)	(143)
Retained Earnings
Significant Accounting Policies [Line Items]
Reclassification of income tax effects	$ 7,092	$ 6,618	$ 6,516	$ 7,092	$ 6,516	$ 6,587	6,112	$ 6,732	$ 6,198	$ 6,364
Implementation of ASU
Significant Accounting Policies [Line Items]
Reclassification of income tax effects							0
Implementation of ASU | Accumulated Other Comprehensive Income (Loss)
Significant Accounting Policies [Line Items]
Reclassification of income tax effects							(25)
Implementation of ASU | Retained Earnings
Significant Accounting Policies [Line Items]
Reclassification of income tax effects							25
ASU No. 2018-02 | Implementation of ASU | Accumulated Other Comprehensive Income (Loss)
Significant Accounting Policies [Line Items]
Reclassification of income tax effects							(25)
ASU No. 2018-02 | Implementation of ASU | Retained Earnings
Significant Accounting Policies [Line Items]
Reclassification of income tax effects							$ 25