Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 3,778	$ 3,022
Lease revenue outside scope of Topic 606	34	39
Electric
Disaggregation of Revenue [Line Items]
Revenues	1,364	1,216
Other revenues outside scope of topic 606	3	4
Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	672	599
Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	451	426
Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	159	156
Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	82	35
Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	4	4
Gas
Disaggregation of Revenue [Line Items]
Revenues	612	540
Alternative Revenue Program revenues outside scope of Topic 606		2
Other revenues outside scope of topic 606	2	2
Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	40	43
Gas | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	461	394
Gas | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	85	77
Gas | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	26	26
Gas Storage and Pipelines
Disaggregation of Revenue [Line Items]
Revenues	197	170
Lease revenue outside scope of Topic 606	2	2
Power and Industrial Projects
Disaggregation of Revenue [Line Items]
Revenues	366	407
Lease revenue outside scope of Topic 606	21	27
Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	1,439	913
Gain (loss) on derivative outside scope of Topic 606	$ 1,100	$ 637