Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 2,583	$ 2,888	$ 5,605	$ 6,402
Lease revenue outside scope of Topic 606	33	42	72	86
Electric
Disaggregation of Revenue [Line Items]
Revenues	1,312	1,190	2,528	2,425
Other revenues outside scope of topic 606	5	5	10	8
Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	671	494	1,269	1,047
Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	389	423	815	843
Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	120	158	276	322
Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	132	115	168	213
Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	3		7
Gas
Disaggregation of Revenue [Line Items]
Revenues	251	243	791	888
Other revenues outside scope of topic 606	3	2	5	4
Alternative Revenue Program revenues outside scope of Topic 606			2	3
Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	23	23	66	85
Gas | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	169	163	563	640
Gas | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	43	42	120	122
Gas | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	16	15	42	41
Gas Storage and Pipelines
Disaggregation of Revenue [Line Items]
Revenues	172	121	342	237
Lease revenue outside scope of Topic 606	2	2	4	4
Power and Industrial Projects
Disaggregation of Revenue [Line Items]
Revenues	219	402	526	790
Lease revenue outside scope of Topic 606	21	30	48	61
Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	740	1,113	1,653	2,414
Gain (loss) on derivative outside scope of Topic 606	$ 467	$ 879	$ 1,100	$ 1,800