Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Significant Accounting Policies [Line Items]
Reclassification of income tax effects	$ 11,892	$ 10,569	$ 11,892	$ 11,892	$ 10,569	$ 11,836	$ 10,717	$ 11,988	$ 11,020
Implementation of ASU						us-gaap:AccountingStandardsUpdate201802Member	us-gaap:AccountingStandardsUpdate201802Member
Effective tax rate increase (decrease)	(9.00%)			(3.00%)
Carryback of 2018 net operating loss due to the CARES Act	12.00%			5.00%
Amortization of TCJA regulatory liability	2.00%			2.00%
Annual production tax credits	4.00%			3.00%
Unrecognized tax benefits	$ 8		8	$ 8
Unrecognized compensation cost	99		99	$ 99
Recognition period (in years)				1 year 7 months 28 days
Uncollectible expense	15	24		$ 48	53
CARES Act
Significant Accounting Policies [Line Items]
Reduction in Income Tax Expense due to carryback of 2018 net operating loss to 2013	34			34
Claim for employee retention credits			6
Deferral of employer payroll taxes			14
CARES Act, AMT Credit Refund
Significant Accounting Policies [Line Items]
AMT credit receivable recorded in anticipation of refund from U.S. Treasury	220		220	220
Immediate Refund of 2018 Remaining AMT Credit Balance
Significant Accounting Policies [Line Items]
AMT credit receivable recorded in anticipation of refund from U.S. Treasury	153		153	153
Immediate Refund of AMT Credit Generated by Carrying Back 2018 Net Operating Loss to 2013
Significant Accounting Policies [Line Items]
AMT credit receivable recorded in anticipation of refund from U.S. Treasury	$ 67		67	$ 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 in excess of 90 days				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)	(4.00%)			(4.00%)
Amortization of TCJA regulatory liability	3.00%			3.00%
Annual production tax credits	1.00%			1.00%
Unrecognized tax benefits	$ 10		10	$ 10
Uncollectible expense	9	14		26	30
DTE Electric | COVID-19 Pandemic
Significant Accounting Policies [Line Items]
Increase to allowance for doubtful accounts				8
Amount deferred as a Regulatory Asset	6		6	6
DTE Electric | CARES Act
Significant Accounting Policies [Line Items]
Claim for employee retention credits			3
Deferral of employer payroll taxes			8
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Income tax receivable	1		1	1		$ 14
Allocated costs	7	11		16	24
DTE Gas | COVID-19 Pandemic
Significant Accounting Policies [Line Items]
Increase to allowance for doubtful accounts				3
Amount deferred as a Regulatory Asset	2		2	2
Accumulated Other Comprehensive Income (Loss)
Significant Accounting Policies [Line Items]
Reclassification of income tax effects	(141)	(146)	(141)	(141)	(146)	(148)	$ (120)	(145)	(143)
Retained Earnings
Significant Accounting Policies [Line Items]
Reclassification of income tax effects	$ 6,618	$ 6,198	$ 6,618	$ 6,618	$ 6,198	$ 6,587	6,112	$ 6,732	$ 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