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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Transactions With Affiliated Companies
The following is a summary of DTE Electric's transactions with affiliated companies:
 
2017
 
2016
 
2015
 
(In millions)
Revenues
 
 
 
 
 
Energy sales
$
9

 
$
10

 
$
2

Other services
$
(4
)
 
$
(1
)
 
$
6

Shared capital assets
$
39

 
$
33

 
$
33

Costs
 
 
 
 
 
Fuel and purchased power
$
6

 
$
10

 
$
9

Other services and interest
$
(2
)
 
$
(1
)
 
$
2

Corporate expenses, net
$
370

 
$
370

 
$
334

Other
 
 
 
 
 
Dividends declared
$
432

 
$
420

 
$
395

Dividends paid
$
432

 
$
420

 
$
395

Capital contribution from DTE Energy
$
100

 
$
120

 
$
300