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Commitments and Contingencies (Purchase Commitments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 $ 3,152
2021 1,055
2022 561
2023 418
2024 365
2025 and thereafter 1,503
Total purchase commitments 7,054
DTE Electric  
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2020 1,556
2021 299
2022 95
2023 96
2024 96
2025 and thereafter 688
Total purchase commitments $ 2,830