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Commitments and Contingencies (Purchase Commitments) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2016 $ 2,038
2017 1,160
2018 611
2019 397
2020 353
2021 and thereafter 3,043
Total Purchase Commitments 7,602
DTE Electric  
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2016 493
2017 412
2018 240
2019 120
2020 88
2021 and thereafter 992
Total Purchase Commitments $ 2,345