Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	$ 38	$ (42)	$ 75	$ (277)
Transfers into Level 3 from Level 2	2	0	2	0
Total gains (losses)
Included in earnings	112	79	208	273
Recorded in Regulatory liabilities	2	(2)	29	3
Purchases, issuances, and settlements
Settlements	(111)	(48)	(271)	(12)
Net Assets (Liabilities) as of end of period	43	(13)	43	(13)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	59	24	90	152
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	2	1	21	10
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	28	14	7	11
Total gains (losses)
Recorded in Regulatory liabilities	2	(2)	29	3
Purchases, issuances, and settlements
Settlements	(9)	(2)	(15)	(4)
Net Assets (Liabilities) as of end of period	21	10	21	10
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	2	1	21	10
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	3	(54)	22	(255)
Transfers into Level 3 from Level 2	0	0	1	0
Total gains (losses)
Included in earnings	7	1	13	163
Recorded in Regulatory liabilities	0	0	0	0
Purchases, issuances, and settlements
Settlements	(15)	25	(41)	64
Net Assets (Liabilities) as of end of period	(5)	(28)	(5)	(28)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	(6)	4	(25)	94
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	0	0	0	0
Electricity
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	9	(4)	47	(33)
Transfers into Level 3 from Level 2	2	0	1	0
Total gains (losses)
Included in earnings	105	79	196	109
Recorded in Regulatory liabilities	0	0	0	0
Purchases, issuances, and settlements
Settlements	(87)	(71)	(215)	(72)
Net Assets (Liabilities) as of end of period	29	4	29	4
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	75	26	156	94
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	0	0	0	0
Other
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	26	16	6	11
Transfers into Level 3 from Level 2	0	0	0	0
Total gains (losses)
Included in earnings	0	(1)	(1)	1
Recorded in Regulatory liabilities	2	(2)	29	3
Purchases, issuances, and settlements
Settlements	(9)	(2)	(15)	(4)
Net Assets (Liabilities) as of end of period	19	11	19	11
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	(10)	(6)	(41)	(36)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period	$ 2	$ 1	$ 21	$ 10