Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 3,284	$ 3,119	$ 8,889	$ 9,521
Lease revenue outside scope of Topic 606	60	57	132	143
Electric
Disaggregation of Revenue [Line Items]
Revenues	1,693	1,520	4,221	3,945
Other revenues outside scope of topic 606	8	5	18	14
Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	900	791	2,169	1,839
Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	498	515	1,313	1,358
Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	157	175	434	497
Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	138	39	305	251
Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	3		10
Gas
Disaggregation of Revenue [Line Items]
Revenues	173	155	964	1,043
Other revenues outside scope of topic 606	2	2	7	6
Alternative Revenue Program revenues outside scope of Topic 606			2
Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	32	18	98	102
Gas | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	92	87	655	727
Gas | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	34	35	154	157
Gas | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	15	15	57	57
Gas Storage and Pipelines
Disaggregation of Revenue [Line Items]
Revenues	204	126	546	363
Lease revenue outside scope of Topic 606	2	2	7	7
Power and Industrial Projects
Disaggregation of Revenue [Line Items]
Revenues	324	406	850	1,196
Lease revenue outside scope of Topic 606	26	33	74	94
Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	1,061	1,105	2,714	3,519
Gain (loss) on derivative outside scope of Topic 606	$ 731	$ 791	$ 1,800	$ 2,600