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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Long-term Purchase Commitments
The Registrants estimate the following commitments from 2016 through 2051 for DTE Energy, and 2016 through 2033 for DTE Electric, as detailed in the following table:
 
DTE Energy
 
DTE Electric
 
(In millions)
2016
$
2,038

 
$
493

2017
1,160

 
412

2018
611

 
240

2019
397

 
120

2020
353

 
88

2021 and thereafter
3,043

 
992

 
$
7,602

 
$
2,345