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Related Party Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Tables)
 9 Months Ended
Sep. 30, 2017
GenOn Americas Generation  
Related Party Transaction  
Summary of material related-party transactions with affiliates
The following costs were incurred under these arrangements:
GenOn Americas Generation
 
Three months ended September 30,
 
Nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Allocated costs:
 
 
 
 
 
 
 
Cost of operations — affiliate
$
—

 
$
—

 
$
(1
)
 
$
2

General and administrative — affiliate
9

 
21

 
53

 
62

Total
$
9

 
$
21

 
$
52

 
$
64
GenOn Mid-Atlantic  
Related Party Transaction  
Summary of material related-party transactions with affiliates
GenOn Mid-Atlantic
 
Three months ended September 30,
 
Nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Allocated costs:
 
 
 
 
 
 
 
Cost of operations — affiliate
$
1

 
$
1

 
$
2

 
$
2

General and administrative — affiliate
4

 
15

 
42

 
45

Total
$
5

 
$
16

 
$
44

 
$
47