Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 3,022	$ 3,514
Lease revenue outside scope of Topic 606	39	44
Electric
Disaggregation of Revenue [Line Items]
Revenues	1,216	1,235
Electric | DTE Electric
Disaggregation of Revenue [Line Items]
Revenues	1,212
Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	4	4
Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	599	553
Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	426	421
Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	156	163
Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	35	98
DTE Sustainable Generation | Other | DTE Electric
Disaggregation of Revenue [Line Items]
Revenues	4
Gas
Disaggregation of Revenue [Line Items]
Revenues	540	645
Gas | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Revenues	2	3
Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	2	2
Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	43	61
Gas | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	394	477
Gas | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	77	81
Gas | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	26	26
Gas Storage and Pipelines
Disaggregation of Revenue [Line Items]
Revenues	170	116
Lease revenue outside scope of Topic 606	2	2
Power and Industrial Projects
Disaggregation of Revenue [Line Items]
Revenues	307	388
Lease revenue outside scope of Topic 606	27	31
Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	913	1,301
Gain (loss) on derivative outside scope of Topic 606	$ 637	$ 926