Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Effective tax rate decrease	6.00%
Annual production tax credits	3.00%
Amortization of TCJA regulatory liability	2.00%
Unrecognized compensation cost	$ 111
Recognition period (in years)	1 year 10 months 6 days
Specific review of probable future collections based on receivable balances, threshold duration	30 days
Uncollectible expense adjusted for regulatory deferrals	$ 31	$ 33
Past due financing receivables	$ 0
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
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 decrease	3.00%
Annual production tax credits	2.00%
Amortization of TCJA regulatory liability	1.00%
Uncollectible expense adjusted for regulatory deferrals	$ 11	17
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Income tax receivable	3		$ 8
Allocated costs	$ 14	$ 9