Leases (Other Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for finance leases	$ 9	$ 8	$ 8
Operating cash flows for operating leases	19	17	19
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	61	5	5
Finance leases	$ 5	$ 3	$ 3
Weighted Average Remaining Lease Term (Years)
Operating leases	18 years 8 months 12 days	12 years 9 months 18 days	12 years 8 months 12 days
Finance leases	8 years 10 months 24 days	8 years 2 months 12 days	7 years 9 months 18 days
Weighted Average Discount Rate
Operating leases	4.40%	3.70%	3.60%
Finance leases	4.00%	2.40%	2.20%
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	12	14
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	61	2	1
Finance leases	$ 5	$ 1	$ 1
Weighted Average Remaining Lease Term (Years)
Operating leases	19 years 9 months 18 days	11 years 1 month 6 days	10 years 3 months 18 days
Finance leases	4 years 6 months	1 year 1 month 6 days	2 years 1 month 6 days
Weighted Average Discount Rate
Operating leases	4.50%	3.40%	3.40%
Finance leases	5.40%	1.00%	1.00%