Segment and Related Information (Financial Data - Net Income (Loss) Attributable to DTE Energy by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	$ 58	$ 372	$ 495	$ 844
Net Income (Loss) attributable to DTE Energy — discontinued operations	(33)	104	106	249
Net Income Attributable to DTE Energy Company/DTE Electric Company	25	476	601	1,093
Electric
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	342	398	788	675
Gas
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	(30)	(20)	146	102
DTE Vantage
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	73	47	115	102
Energy Trading
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	(52)	(28)	(173)	5
Corporate and Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Income (Loss) attributable to DTE Energy — continuing operations	$ (275)	$ (25)	$ (381)	$ (40)