Available-for-Sale Securities (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2015

Dec. 31, 2014

Available-for-Sale Securities

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.

	June 30, 2015								December 31, 2014
	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	$	15	$	—	$	—	$	15	$	19	$	—	$	—	$	19
Equity securities		292		420		—		712		283		417		—		700
Debt securities		225		7		1		231		218		11		—		229
Receivables/payables, net		—		—		—		—		2		—		—		2
Total NDT funds	$	532	$	427	$	1	$	958	$	522	$	428	$	—	$	950
Auction rate securities	$	7	$	—	$	—	$	7	$	8	$	—	$	—	$	8

Investments Classified by Contractual Maturity Date

The following table shows the scheduled maturity dates of debt securities held at June 30, 2015.

	Maturity Less Than 1 Year		Maturity 1-5 Years		Maturity 6-10 Years		Maturity in Excess of 10 Years		Total
Amortized cost	$	10	$	82	$	75	$	65	$	232
Fair value		10		84		76		68		238

Proceeds From and Realized Gains and Losses on Sales of Available-for-sale Securities

The following table shows proceeds from and realized gains and losses on sales of available-for-sale securities for the period ended June 30.

	Six Months
	2015		2014
Proceeds from sales of NDT securities (a)	$	100	$	65
Other proceeds from sales		—		3
Gross realized gains (b)		13		8
Gross realized losses (b)		9		4

(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.

PPL Energy Supply LLC [Member]

Available-for-Sale Securities

The following table shows the amortized cost, the gross unrealized gains and losses recorded in AOCI and the fair value of available-for-sale securities.

	December 31, 2014							December 31, 2013
	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	$	19				$	19	$	14					$	14
Equity securities		283	$	417			700		265	$	363				628
Debt securities		218		11			229		217		7	$	3		221
Receivables/payables, net		2					2		1						1
Total NDT funds	$	522	$	428		$	950	$	497	$	370	$	3	$	864
Auction rate securities:	$	8					8	$	17			$	1	$	16

Investments Classified by Contractual Maturity Date

The following table shows the scheduled maturity dates of debt securities held at December 31, 2014.

	Maturity Less Than 1 Year		Maturity 1-5 Years		Maturity 6-10 Years		Maturity in Excess 10 Year		Total
Amortized cost	$	10	$	87	$	64	$	65	$	226
Fair value		10		89		67		71		237

Proceeds From and Realized Gains and Losses on Sales of Available-for-sale Securities

The following table shows proceeds from and realized gains and losses on sales of available-for-sale securities.

	2014		2013		2012
Proceeds from sales of NDT securities (a)	$	154	$	144	$	139
Other proceeds from sales		9				3
Gross realized gains (b)		23		17		29
Gross realized losses (b)		10		7		21

(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.