Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	$ 13	$ 75
Transfers into Level 3 from Level 2	2	0
Transfers from Level 3 into Level 2	2	0
Total gains (losses)
Included in earnings	(59)	(29)
Recorded in Regulatory liabilities	(2)	(2)
Purchases, issuances, and settlements
Settlements	(45)	(70)
Net Assets (Liabilities) as of end of period	(89)	(26)
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	(110)	(38)
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	2
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	9	7
Total gains (losses)
Recorded in Regulatory liabilities	(2)	(2)
Purchases, issuances, and settlements
Settlements	(4)	(2)
Net Assets (Liabilities) as of end of period	3	3
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	2
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	(18)	22
Transfers into Level 3 from Level 2	2	0
Transfers from Level 3 into Level 2	0	0
Total gains (losses)
Included in earnings	(22)	(25)
Recorded in Regulatory liabilities	0	0
Purchases, issuances, and settlements
Settlements	38	0
Net Assets (Liabilities) as of end of period	0	(3)
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	(17)	(39)
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
Electricity
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	24	47
Transfers into Level 3 from Level 2	0	0
Transfers from Level 3 into Level 2	0	0
Total gains (losses)
Included in earnings	(37)	(3)
Recorded in Regulatory liabilities	0	0
Purchases, issuances, and settlements
Settlements	(78)	(69)
Net Assets (Liabilities) as of end of period	(91)	(25)
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	(92)	1
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
Other
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	7	6
Transfers into Level 3 from Level 2	0	0
Transfers from Level 3 into Level 2	2
Total gains (losses)
Included in earnings	0	(1)
Recorded in Regulatory liabilities	(2)	(2)
Purchases, issuances, and settlements
Settlements	(5)	(1)
Net Assets (Liabilities) as of end of period	2	2
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	(1)	0
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	$ 2