Leases (Future Minimum Lease Payments) (Details) $ in Millions	Dec. 31, 2025 USD ($)
Operating Leases
2026	$ 37
2027	35
2028	32
2029	21
2030	13
2031 and thereafter	400
Total future minimum lease payments	538
Imputed interest	(271)
Lease liabilities	267
Finance Leases
2026	5
2027	4
2028	4
2029	1
2030	1
2031 and thereafter	5
Total future minimum lease payments	20
Imputed interest	(2)
Lease liabilities	18
DTE Electric
Operating Leases
2026	31
2027	30
2028	28
2029	17
2030	10
2031 and thereafter	379
Total future minimum lease payments	495
Imputed interest	(262)
Lease liabilities	233
Finance Leases
2026	3
2027	3
2028	3
2029	0
2030	0
2031 and thereafter	0
Total future minimum lease payments	9
Imputed interest	0
Lease liabilities	$ 9