Revenue (Disaggregation of Revenue By Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 3,715	$ 3,080	$ 10,317	$ 8,343
Electric
Disaggregation of Revenue [Line Items]
Revenues	1,702	1,693	4,477	4,221
Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	885	900	2,262	2,169
Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	533	498	1,452	1,313
Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	167	157	473	434
Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	117	138	290	305
Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	2	3	9	10
Gas
Disaggregation of Revenue [Line Items]
Revenues	193	173	1,070	964
Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	44	32	114	98
Gas | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	95	92	726	655
Gas | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	38	34	171	154
Gas | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	16	15	59	57
DTE Vantage
Disaggregation of Revenue [Line Items]
Revenues	372	324	1,132	850
Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	$ 1,602	$ 1,061	$ 4,208	$ 2,714