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Leases (Future Minimum Lease Payments for Operating Leases - Topic 840) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]  
2019 $ 42
2020 30
2021 18
2022 11
2023 8
2024 and thereafter 45
Total future minimum lease payments 154
DTE Electric  
Lessee, Lease, Description [Line Items]  
2019 17
2020 12
2021 10
2022 7
2023 5
2024 and thereafter 29
Total future minimum lease payments $ 80