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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 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	$ (26)	$ (98)	$ 75	$ (277)
Transfers into Level 3 from Level 2	1	0
Total gains (losses)
Included in earnings	123	87	95	194
Recorded in Regulatory liabilities	30	14	27	5
Purchases, issuances, and settlements
Settlements	(90)	(45)	(159)	36
Net Assets (Liabilities) as of end of period	38	(42)	38	(42)
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	69	(14)	32	127
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	28	14	28	14
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	3	1	7	11
Total gains (losses)
Recorded in Regulatory liabilities	30	14	27	5
Purchases, issuances, and settlements
Settlements	(5)	(1)	(6)	(2)
Net Assets (Liabilities) as of end of period	28	14	28	14
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	28	14	28	14
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)	(62)	22	(255)
Transfers into Level 3 from Level 2	1	0
Total gains (losses)
Included in earnings	31	11	7	162
Recorded in Regulatory liabilities	0	0	0	0
Purchases, issuances, and settlements
Settlements	(26)	(3)	(26)	39
Net Assets (Liabilities) as of end of period	3	(54)	3	(54)
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	20	(3)	(18)	90
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	(25)	(38)	47	(33)
Transfers into Level 3 from Level 2	0	0
Total gains (losses)
Included in earnings	93	75	90	30
Recorded in Regulatory liabilities	0	0	0	0
Purchases, issuances, and settlements
Settlements	(59)	(41)	(128)	(1)
Net Assets (Liabilities) as of end of period	9	(4)	9	(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	80	49	81	68
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	2	2	6	11
Transfers into Level 3 from Level 2	0	0
Total gains (losses)
Included in earnings	(1)	1	(2)	2
Recorded in Regulatory liabilities	30	14	27	5
Purchases, issuances, and settlements
Settlements	(5)	(1)	(5)	(2)
Net Assets (Liabilities) as of end of period	26	16	26	16
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	(31)	(32)	(31)	(31)
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	$ 28	$ 14	$ 28	$ 14