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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2016
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 March 31 were as follows.
| Unrealized gains (losses) |  | Defined benefit plans |  |
| Available- for-sale securities |  | Qualifying derivatives |  | Prior service costs |  | Actuarial gain (loss) |  | Total
December 31, 2015 | $ | 194 |  |  | $ | 44 |  |  | $ | 3 |  |  | $ | (267 | ) |  | $ | (26 | )
Amounts arising during the period | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |
Reclassifications from AOCI | 1 |  |  | (3 | ) |  | — |  |  | 3 |  |  | 1 |
Net OCI during the period | 4 |  |  | (3 | ) |  | — |  |  | 3 |  |  | 4 |
March 31, 2016 | $ | 198 |  |  | $ | 41 |  |  | $ | 3 |  |  | $ | (264 | ) |  | $ | (22 | )
December 31, 2014 | $ | 202 |  |  | $ | 63 |  |  | $ | 7 |  |  | $ | (295 | ) |  | $ | (23 | )
Amounts arising during the period | 5 |  |  | — |  |  | — |  |  | — |  |  | 5 |
Reclassifications from AOCI | (1 | ) |  | (4 | ) |  | — |  |  | 4 |  |  | (1 | )
Net OCI during the period | 4 |  |  | (4 | ) |  | — |  |  | 4 |  |  | 4 |
March 31, 2015 | $ | 206 |  |  | $ | 59 |  |  | $ | 7 |  |  | $ | (291 | ) |  | $ | (19 | )
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 March 31. 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 8 for additional information.
|  | Three Months |  | Affected Line Item on the
Details about AOCI |  | 2016 |  | 2015 |  | Statements of Income
Available-for-sale securities |  | $ | (2 | ) |  | $ | 2 |  |  | Other Income (Expense) - net
Income Taxes |  | 1 |  |  | (1 | ) |  |
Total After-tax |  | (1 | ) |  | 1 |  |  |
Qualifying derivatives |  |  |  |  |  |
Commodity contracts |  | (3 | ) |  | (2 | ) |  | Wholesale energy
|  | 8 |  |  | 8 |  |  | Fuel and energy purchases
|  | — |  |  | 1 |  |  | Other
Total Pre-tax |  | 5 |  |  | 7 |  |  |
Income Taxes |  | (2 | ) |  | (3 | ) |  |
Total After-tax |  | 3 |  |  | 4 |  |  |
Defined benefit plans |  |  |  |  |  |
Net actuarial loss |  | (5 | ) |  | (7 | ) |  |
Total Pre-tax |  | (5 | ) |  | (7 | ) |  |
Income Taxes |  | 2 |  |  | 3 |  |  |
Total After-tax |  | (3 | ) |  | (4 | ) |  |
Total reclassifications during the period |  | $ | (1 | ) |  | $ | 1 |  |  |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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