Segment and Related Information (Financial Data - Inter-segment Billing) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating Revenues	$ (3,715)	$ (3,080)	$ (10,317)	$ (8,343)
Electric
Segment Reporting Information [Line Items]
Operating Revenues	(1,702)	(1,693)	(4,477)	(4,221)
Gas
Segment Reporting Information [Line Items]
Operating Revenues	(193)	(173)	(1,070)	(964)
DTE Vantage
Segment Reporting Information [Line Items]
Operating Revenues	(372)	(324)	(1,132)	(850)
Energy Trading
Segment Reporting Information [Line Items]
Operating Revenues	(1,602)	(1,061)	(4,208)	(2,714)
Reconciliation and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	155	164	558	391
Reconciliation and Eliminations | Electric
Segment Reporting Information [Line Items]
Operating Revenues	17	16	48	46
Reconciliation and Eliminations | Gas
Segment Reporting Information [Line Items]
Operating Revenues	3	4	10	12
Reconciliation and Eliminations | DTE Vantage
Segment Reporting Information [Line Items]
Operating Revenues	125	134	463	308
Reconciliation and Eliminations | Energy Trading
Segment Reporting Information [Line Items]
Operating Revenues	9	9	35	23
Reconciliation and Eliminations | Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues	$ 1	$ 1	$ 2	$ 2