Segment and Related Information (Financial Data - Operating Revenues including Inter-segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	$ 1,875	$ 1,844	$ 5,483	$ 5,119
Operating Revenues — Non-utility operations	1,840	1,236	4,834	3,224
Operating Revenues	3,715	3,080	10,317	8,343
Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	(155)	(172)	(572)	(408)
Operating Revenues	(155)	(164)	(558)	(391)
Electric
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	1,702	1,693	4,477	4,221
Electric | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	1,700	1,690	4,468	4,211
Operating Revenues — Non-utility operations	2	3	9	10
Electric | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	(17)	(16)	(48)	(46)
Gas
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	193	173	1,070	964
Gas | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Utility operations	193	173	1,070	964
Gas | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	(3)	(4)	(10)	(12)
DTE Vantage
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	372	324	1,132	850
DTE Vantage | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	372	324	1,132	850
DTE Vantage | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	(125)	(134)	(463)	(308)
Energy Trading
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	1,602	1,061	4,208	2,714
Energy Trading | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	1,602	1,061	4,208	2,714
Energy Trading | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	(9)	(9)	(35)	(23)
Corporate and Other | Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations	1	1	2	2
Corporate and Other | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues	$ (1)	(1)	(2)	(2)
Gas Storage and Pipelines | Reconciliation and Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenues — Non-utility operations		$ 8	$ 14	$ 17