Leases (Future Minimum Lease Payments) (Details) $ in Millions	Dec. 31, 2024 USD ($)
Operating Leases
2025	$ 22
2026	22
2027	22
2028	20
2029	16
2030 and thereafter	264
Total future minimum lease payments	366
Imputed interest	(178)
Lease liabilities	188
Finance Leases
2025	5
2026	4
2027	4
2028	4
2029	1
2030 and thereafter	7
Total future minimum lease payments	25
Imputed interest	(2)
Lease liabilities	23
DTE Electric
Operating Leases
2025	18
2026	19
2027	19
2028	18
2029	13
2030 and thereafter	241
Total future minimum lease payments	328
Imputed interest	(168)
Lease liabilities	160
Finance Leases
2025	4
2026	3
2027	3
2028	3
2029	0
2030 and thereafter	0
Total future minimum lease payments	13
Imputed interest	(1)
Lease liabilities	$ 12