Derivative Instruments and Hedging Activities (Tables) - PPL Energy Supply LLC [Member]

6 Months Ended

12 Months Ended

Jun. 30, 2015

Dec. 31, 2014

Commodity Price Risk (Non-trading) - Economic Activity - Pre-tax Gains (Losses) Associated with Economic Activity

The unrealized gains (losses) for economic activity for the periods ended June 30 were as follows.

	Six Months
	2015			2014
Operating Revenues
Wholesale energy	$	(157	)	$	(880	)
Retail energy		(22	)		(22	)
Operating Expenses
Fuel		16			6
Energy purchases		240			619

The unrealized gains (losses) for economic activity for the years ended December 31 were as follows.

	2014			2013			2012
Operating Revenues
Unregulated wholesale energy	$	325		$	(721	)	$	(311	)
Unregulated retail energy		29			12			(17	)
Operating Expenses
Fuel		(27	)		(4	)		(14	)
Energy purchases		(327	)		586			442

Commodity Volumes - Volumes of Derivative (Sales) Purchase Contracts

At June 30, 2015, the net volumes of derivative (sales)/purchase contracts used in support of the various strategies discussed above were as follows.

		Volumes (a)
Commodity	Unit of Measure	2015 (b)			2016			2017			Thereafter
Power	MWh		(27,008,748	)		(30,860,046	)		(1,418,861	)		(795,983	)
Capacity	MW-Month		(1,402	)		(878	)		6			3
Gas	MMBtu		131,915,232			79,690,567			(4,928,278	)		(4,089,820	)
FTRs	MW-Month		3,178			2,870			—			—
Oil	Barrels		143,204			142,778			134,701			60,000
CRRs	MWh		1,128,574			1,393,430			—			—

(a) Volumes for option contracts factor in the probability of an option being exercised and may be less than the notional amount of the option.

(b) Represents balance of the current year.

At December 31, 2014, the net volumes of derivative (sales)/purchase contracts used in support of the various strategies discussed above were as follows.

		Volumes (a)
	Unit of Measure	2015			2016			2017		Thereafter
Power	MWh		(39,946,543	)		(4,999,532	)		741,005		3,426,579
Capacity	MW-Month		(6,604	)		(249	)		6		3
Gas	MMBtu		136,349,655			42,144,483			5,804,511		8,969,760
FTRs	MW-Month		2,803
Oil	Barrels		421,019			374,334			251,670		60,000

(a) Volumes for option contracts factor in the probability of an option being exercised and may be less than the notional amount of the option.

Fair Value and Balance Sheet Location of Derivative Instruments

The following table presents the fair value and location of commodity derivative instruments not designated as hedging instruments recorded on the Balance Sheets.

	June 30, 2015				December 31, 2014
	Assets		Liabilities		Assets		Liabilities
Current:
Price Risk Management Assets/Liabilities:	$	803	$	761	$	1,079	$	1,024
Noncurrent:
Price Risk Management Assets/Liabilities:		232		199		239		193
Total derivatives	$	1,035	$	960	$	1,318	$	1,217

The following tables present the fair value and location of derivatives not designated as hedging instruments recorded on the Balance Sheets.

	December 31, 2014				December 31, 2013
	Assets		Liabilities		Assets		Liabilities
Current:
Price Risk Management Assets/Liabilities (a):
Commodity contracts	$	1,079	$	1,024	$	860	$	750
Total current		1,079		1,024		860		750
Noncurrent:
Price Risk Management Assets/Liabilities (a):
Commodity contracts		239		193		328		320
Total noncurrent		239		193		328		320
Total derivatives	$	1,318	$	1,217	$	1,188	$	1,070

(a) Represents the location on the Balance Sheets.

Pre-tax Gain (Loss) on Derivative Instruments Recognized in Income or on the Balance Sheet

The following tables present the pre-tax effect of derivative instruments recognized in income for the period ended June 30, 2015.

	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Derivative Relationships		Six Months
Cash Flow Hedges:
Commodity contracts	Wholesale energy	$	—
	Energy purchases		16
	Depreciation		1
Total		$	17

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Six Months
Commodity contracts	Wholesale energy	$	31
	Retail energy		(31	)
	Fuel		1
	Energy purchases		14
	Total	$	(15	)

The following tables present the pre-tax effect of derivative instruments recognized in income for the period ended June 30, 2014.

	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Derivative Relationships		Six Months
Cash Flow Hedges:
Commodity contracts	Wholesale energy	$	1
	Energy purchases		15
	Depreciation		1
	Discontinued operations		5
Total		$	22

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Six Months
Commodity contracts	Wholesale energy (a)	$	(3,137	)
	Retail energy		(52	)
	Fuel		7
	Energy purchases (b)		2,442
	Discontinued operations		2
	Total	$	(738	)

(a) 2014 includes significant realized and unrealized losses on physical and financial commodity sales contracts due to the unusually cold weather.

(b) 2014 includes significant realized and unrealized gains on physical and financial commodity purchase contracts due to the unusually cold weather.

The following tables present the pre-tax effect of derivative instruments recognized in income or OCI.

Derivative Relationship	Derivative Gain (Loss) Recognized in OCI (Effective Portion)		Location of Gain (Loss) Recognized in Income	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)			Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
2014
Cash Flow Hedges:
Commodity contracts			Unregulated wholesale energy	$	1
			Energy purchases		31
			Depreciation		2
			Discontinued operations		8
Total				$	42
2013
Cash Flow Hedges:
Commodity contracts			Unregulated wholesale energy	$	240		$	1
			Energy Purchases		(58	)
			Depreciation		2
			Discontinued operations		23
Total				$	207		$	1
2012
Cash Flow Hedges:
Commodity contracts	$	114	Unregulated wholesale energy	$	838		$	(1	)
			Energy purchases		(136	)		(2	)
			Depreciation		2
			Discontinued operations		50
Total	$	114		$	754		$	(3	)

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	2014			2013			2012
Commodity contracts	Unregulated wholesale energy	$	(1,353	)	$	(99	)	$	1,182
	Unregulated retail energy		30			25			30
	Fuel		(30	)		2
	Energy purchases		1,013			130			(965	)
	Discontinued operations		6			14			17
	Total	$	(334	)	$	72		$	264

Derivative Positions Eligible for Offset with Related Cash Collateral

The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.

	Assets								Liabilities
			Eligible for Offset								Eligible for Offset
	Gross		Derivative Instruments		Cash Collateral Received		Net		Gross		Derivative Instruments		Cash Collateral Pledged		Net
December 31, 2014
Energy Commodities	$	1,318	$	1,060	$	10	$	248	$	1,217	$	1,060	$	58	$	99
December 31, 2013
Energy Commodities	$	1,188	$	912	$	7	$	269	$	1,070	$	912	$	1	$	157

Credit Risk-Related Contingent Features

At December 31, 2014, derivative contracts in a net liability position that contain credit risk-related contingent features, collateral posted on those positions and the related effect of a decrease in credit ratings below investment grade are summarized as follows:

Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features	$	98
Aggregate fair value of collateral posted on these derivative instruments		106
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade (a) (b)		26

(a) Includes the effect of net receivables and payables already recorded on the Balance Sheet.

(b) During the second quarter of 2014, PPL Energy Supply experienced a downgrade in its corporate credit ratings to below investment grade. Amounts related to PPL Energy Supply represent net liability positions subject to further adequate assurance features.

Derivative Positions Eligible for Offset with Related Cash Collateral

The table below summarizes the energy commodities derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.

	Assets								Liabilities
			Eligible for Offset								Eligible for Offset
	Gross		Derivative Instruments		Cash Collateral Received		Net		Gross		Derivative Instruments		Cash Collateral Pledged		Net
June 30, 2015	$	1,035	$	795	$	39	$	201	$	960	$	795	$	35	$	130
December 31, 2014	$	1,318	$	1,060	$	10	$	248	$	1,217	$	1,060	$	58	$	99