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Commitments and Contingencies (Purchase Commitments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 $ 2,998
2022 1,142
2023 804
2024 520
2025 397
2026 and thereafter 1,634
Total purchase commitments 7,495
DTE Electric  
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 1,132
2022 246
2023 226
2024 159
2025 209
2026 and thereafter 969
Total purchase commitments $ 2,941