Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 3,229	$ 2,583	$ 7,007	$ 5,605
Lease revenue outside scope of Topic 606	34	33	68	72
Electric
Disaggregation of Revenue [Line Items]
Revenues	1,411	1,312	2,775	2,528
Other revenues outside scope of topic 606	5	5	8	10
Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	705	671	1,377	1,269
Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	468	389	920	815
Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	147	120	306	276
Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	91	132	172	168
Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	3	3	7	7
Gas
Disaggregation of Revenue [Line Items]
Revenues	265	251	877	791
Other revenues outside scope of topic 606	2	3	4	5
Alternative Revenue Program revenues outside scope of Topic 606				2
Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	29	23	70	66
Gas | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	171	169	631	563
Gas | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	48	43	133	120
Gas | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	17	16	43	42
Gas Storage and Pipelines
Disaggregation of Revenue [Line Items]
Revenues	208	172	405	342
Lease revenue outside scope of Topic 606	2	2	4	4
Power and Industrial Projects
Disaggregation of Revenue [Line Items]
Revenues	394	219	760	526
Lease revenue outside scope of Topic 606	22	21	44	48
Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	1,167	740	2,606	1,653
Gain on derivatives outside scope of Topic 606	$ 907	$ 467	$ 2,100	$ 1,100