Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	$ 24	$ (33)	$ 4	$ (44)
Transfers into Level 3 from Level 2	2	1
Transfers from Level 3 into Level 2	(5)	0	(4)	0
Total gains (losses)
Included in earnings	37	40	81	40
Recorded in/Change in fair value recorded in Regulatory liabilities	14	9	12	7
Purchases, issuances, and settlements
Settlements	(26)	(8)	(47)	6
Net Assets (Liabilities) as of end of period	46	9	46	9
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30, 2020 and 2019	22	33	63	28
DTE Electric
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	1	2	3	6
Total gains (losses)
Recorded in/Change in fair value recorded in Regulatory liabilities	14	9	12	7
Purchases, issuances, and settlements
Settlements	(5)	(2)	(5)	(4)
Net Assets (Liabilities) as of end of period	10	9	10	9
The amount of total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets held at June 30, 2020 and 2019 and reflected in DTE Electric's Consolidated Statements of Financial Position	10	9	10	9
Natural gas
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	8	(10)	(15)	(49)
Transfers into Level 3 from Level 2	2	1
Transfers from Level 3 into Level 2	(5)	0	(4)	0
Total gains (losses)
Included in earnings	12	(1)	36	31
Recorded in/Change in fair value recorded in Regulatory liabilities	0	0	0	0
Purchases, issuances, and settlements
Settlements	3	0	3	8
Net Assets (Liabilities) as of end of period	20	(10)	20	(10)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30, 2020 and 2019	18	(1)	37	16
Electricity
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	15	(25)	16	(2)
Transfers into Level 3 from Level 2	0	0
Transfers from Level 3 into Level 2	0	0	0	0
Total gains (losses)
Included in earnings	33	41	53	10
Recorded in/Change in fair value recorded in Regulatory liabilities	0	0	0	0
Purchases, issuances, and settlements
Settlements	(32)	(6)	(53)	2
Net Assets (Liabilities) as of end of period	16	10	16	10
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30, 2020 and 2019	20	38	42	17
Other
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	1	2	3	7
Transfers into Level 3 from Level 2	0	0
Transfers from Level 3 into Level 2	0	0	0	0
Total gains (losses)
Included in earnings	(8)	0	(8)	(1)
Recorded in/Change in fair value recorded in Regulatory liabilities	14	9	12	7
Purchases, issuances, and settlements
Settlements	3	(2)	3	(4)
Net Assets (Liabilities) as of end of period	10	9	10	9
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30, 2020 and 2019	$ (16)	$ (4)	$ (16)	$ (5)