Leases (Future Minimum Lease Payments) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Operating Leases
2024	$ 20
2025	15
2026	14
2027	12
2028	10
2029 and thereafter	134
Total future minimum lease payments	205
Imputed interest	(80)
Lease liabilities	125
Finance Leases
2024	3
2025	3
2026	2
2027	2
2028	2
2029 and thereafter	6
Total future minimum lease payments	18
Imputed interest	(2)
Lease liabilities	16
DTE Electric
Operating Leases
2024	16
2025	12
2026	10
2027	10
2028	8
2029 and thereafter	110
Total future minimum lease payments	166
Imputed interest	(70)
Lease liabilities	96
Finance Leases
2024	2
2025	1
2026	1
2027	1
2028	1
2029 and thereafter	0
Total future minimum lease payments	6
Imputed interest	0
Lease liabilities	$ 6