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Commitments and Contingencies (Purchase Commitments) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2017 $ 2,394
2018 1,226
2019 570
2020 412
2021 373
2022 and thereafter 2,745
Total purchase commitments 7,720
DTE Electric  
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2017 515
2018 520
2019 165
2020 104
2021 104
2022 and thereafter 904
Total purchase commitments $ 2,312