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, 2024	Mar. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	$ 75	$ (277)
Total gains (losses)
Included in earnings	(29)	107
Recorded in Regulatory liabilities	(2)	(9)
Purchases, issuances, and settlements
Settlements	(70)	81
Net Assets (Liabilities) as of end of period	(26)	(98)
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	(38)	114
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	(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	7	11
Total gains (losses)
Recorded in Regulatory liabilities	(2)	(9)
Purchases, issuances, and settlements
Settlements	(2)	(1)
Net Assets (Liabilities) as of end of period	3	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	2	(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	22	(255)
Total gains (losses)
Included in earnings	(25)	151
Recorded in Regulatory liabilities	0	0
Purchases, issuances, and settlements
Settlements	0	42
Net Assets (Liabilities) as of end of period	(3)	(62)
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	(39)	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
Electricity
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Assets (Liabilities) as of beginning of period	47	(33)
Total gains (losses)
Included in earnings	(3)	(45)
Recorded in Regulatory liabilities	0	0
Purchases, issuances, and settlements
Settlements	(69)	40
Net Assets (Liabilities) as of end of period	(25)	(38)
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	19
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	6	11
Total gains (losses)
Included in earnings	(1)	1
Recorded in Regulatory liabilities	(2)	(9)
Purchases, issuances, and settlements
Settlements	(1)	(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	0	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	$ 2	$ (2)