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NDT Funds (Tables) | 3 Months Ended
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Mar. 31, 2016
Available-for-sale Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The following table shows the amortized cost, the gross unrealized gains and losses recorded in AOCI and the fair value of Talen Energy's available-for-sale securities.
| March 31, 2016 |  | December 31, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
NDT funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Equity securities | 301 |  |  | 409 |  |  | — |  |  | 710 |  |  | 297 |  |  | 406 |  |  | — |  |  | 703 |
Debt securities | 233 |  |  | 12 |  |  | — |  |  | 245 |  |  | 230 |  |  | 7 |  |  | — |  |  | 237 |
Receivables/payables, net | 2 |  |  | — |  |  | — |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | — |
Total NDT funds | $ | 543 |  |  | $ | 421 |  |  | $ | — |  |  | $ | 964 |  |  | $ | 538 |  |  | $ | 413 |  |  | $ | — |  |  | $ | 951 |
Investments Classified by Contractual Maturity Date | The following table shows the scheduled maturity dates of debt securities held at March 31, 2016.
| Maturity Less Than 1 Year |  | Maturity 1-5 Years |  | Maturity 6-10 Years |  | Maturity in Excess of 10 Years |  | Total
Amortized cost | $ | 5 |  |  | $ | 106 |  |  | $ | 68 |  |  | $ | 54 |  |  | $ | 233 |
Fair value | 5 |  |  | 109 |  |  | 71 |  |  | 60 |  |  | 245 |
Schedule of Realized Gain (Loss) | The following table shows proceeds from and realized gains and losses on sales of available-for-sale securities for the period ended March 31.
| Three Months
| 2016 |  | 2015
Proceeds from sales of NDT securities (a) | $ | 54 |  |  | $ | 38 |
Gross realized gains (b) | 6 |  |  | 5 |
Gross realized losses (b) | 8 |  |  | 3 |
(a) | These proceeds are used to pay income taxes and fees related to managing the trust. Remaining proceeds are reinvested in the trust.
(b) | Excludes the impact of other-than-temporary impairment charges recognized on the Statements of Income.

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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