Leases (Other Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for finance leases	$ 9	$ 9	$ 8
Operating cash flows for operating leases	19	19	17
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	75	61	5
Finance leases	$ 16	$ 5	$ 3
Weighted Average Remaining Lease Term (Years)
Operating leases	23 years 3 months 18 days	18 years 8 months 12 days	12 years 9 months 18 days
Finance leases	7 years 4 months 24 days	8 years 10 months 24 days	8 years 2 months 12 days
Weighted Average Discount Rate
Operating leases	4.80%	4.40%	3.70%
Finance leases	4.60%	4.00%	2.40%
DTE Electric
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for finance leases	$ 7	$ 7	$ 7
Operating cash flows for operating leases	15	15	12
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	74	61	2
Finance leases	$ 14	$ 5	$ 1
Weighted Average Remaining Lease Term (Years)
Operating leases	24 years 9 months 18 days	19 years 9 months 18 days	11 years 1 month 6 days
Finance leases	4 years	4 years 6 months	1 year 1 month 6 days
Weighted Average Discount Rate
Operating leases	4.90%	4.50%	3.40%
Finance leases	5.80%	5.40%	1.00%