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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of changes in AOCI by component
The after-tax changes in Talen Energy's AOCI by component for the periods ended September 30 were as follows.         

 
Unrealized gains (losses)
 
Defined benefit plans
 
 
 
Available-
for-sale
securities
 
Qualifying
derivatives
 
Prior
service
costs
 
Actuarial
gain
(loss)
 
Total
December 31, 2014
$
202

 
$
63

 
$
7

 
$
(295
)
 
$
(23
)
Amounts arising during the period
(21
)
 
—

 
(4
)
 
46

 
21

Reclassifications from AOCI
(1
)
 
(14
)
 
(1
)
 
12

 
(4
)
Net OCI during the period
(22
)
 
(14
)
 
(5
)
 
58

 
17

September 30, 2015
$
180

 
$
49

 
$
2

 
$
(237
)
 
$
(6
)
 
 
 
 
 
 
 
 
 
 
December 31, 2013
$
173

 
$
88

 
$
(4
)
 
$
(180
)
 
$
77

Amounts arising during the period
18

 
—

 
—

 
—

 
18

Reclassifications from AOCI
(5
)
 
(18
)
 
2

 
4

 
(17
)
Net OCI during the period
13

 
(18
)
 
2

 
4

 
1

September 30, 2014
$
186

 
$
70

 
$
(2
)
 
$
(176
)
 
$
78
Reclassification from AOCI
The following table presents the gains (losses) and related income taxes for reclassifications from Talen Energy's AOCI for the periods ended September 30.  The defined benefit plan components of AOCI are not reflected in their entirety in the statement of income during the periods; rather, they are included in the computation of net periodic defined benefit costs (credits).  See Note 9 for additional information.     

 
 
Three Months
 
Nine Months
 
Affected Line Item on the
Details about AOCI
 
2015
 
2014
 
2015
 
2014
 
Statements of Income
Available-for-sale securities
 
$
(1
)
 
$
7

 
$
3

 
$
11

 
Other Income (Expense) - net
Income Taxes
 
—

 
(4
)
 
(2
)
 
(6
)
 
 
Total After-tax
 
(1
)
 
3

 
1

 
5

 
 
 
 
 
 
 
 
 
 
 
 
 
Qualifying derivatives
 
 
 
 
 
 
 
 
 
 
Commodity contracts
 
(3
)
 
(2
)
 
(3
)
 
(1
)
 
Wholesale energy
 
 
9

 
8

 
25

 
23

 
Energy purchases
 
 
—

 
1

 
—

 
6

 
Discontinued operations
 
 
—

 
—

 
1

 
1

 
Other
Total Pre-tax
 
6

 
7

 
23

 
29

 
 
Income Taxes
 
(2
)
 
(2
)
 
(9
)
 
(11
)
 
 
Total After-tax
 
4

 
5

 
14

 
18

 
 
 
 
 
 
 
 
 
 
 
 
 
Defined benefit plans
 
 
 
 
 
 
 
 
 
 
Prior service costs
 
—

 
(2
)
 
1

 
(4
)
 
 
Net actuarial loss
 
(5
)
 
(1
)
 
(20
)
 
(6
)
 
 
Total Pre-tax
 
(5
)
 
(3
)
 
(19
)
 
(10
)
 
 
Income Taxes
 
2

 
1

 
8

 
4

 
 
Total After-tax
 
(3
)
 
(2
)
 
(11
)
 
(6
)
 
 
Total reclassifications during the period
 
$
—

 
$
6

 
$
4

 
$
17