Leases (Future Minimum Lease Payments - Topic 842) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leases
2020	$ 38
2021	30
2022	26
2023	20
2024	12
2025 and thereafter	67
Total future minimum lease payments	193
Imputed interest	(33)
Total	160
Finance Leases
2020	5
2021	5
2022	1
2023	1
2024	1
2025 and thereafter	4
Total future minimum lease payments	17
Imputed interest	(2)
Total	15
DTE Electric
Operating Leases
2020	14
2021	13
2022	12
2023	10
2024	8
2025 and thereafter	38
Total future minimum lease payments	95
Imputed interest	(16)
Total	79
Finance Leases
2020	3
2021	4
2022	0
2023	0
2024	0
2025 and thereafter	0
Total future minimum lease payments	7
Imputed interest	0
Total	$ 7