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Commitments and Contingencies (Purchase Commitments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 $ 2,691
2020 1,311
2021 632
2022 409
2023 351
2024 and thereafter 1,953
Total purchase commitments 7,347
DTE Electric  
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2019 777
2020 541
2021 171
2022 88
2023 85
2024 and thereafter 737
Total purchase commitments $ 2,399