Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	$ (2,128)		$ (1,940)
Amounts arising during the period	93		(48)
Reclassifications from accumulated other comprehensive income	28		(19)
Net other comprehensive income during the period	121	81	(67)	(251)
Balance at end of period	(2,007)		(2,007)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(401)		(149)
Amounts arising during the period	87		(165)
Reclassifications from accumulated other comprehensive income
Net other comprehensive income during the period	87		(165)
Balance at end of period	(314)		(314)
Available For Sale Securities Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	135		112
Amounts arising during the period	15		40
Reclassifications from accumulated other comprehensive income			(2)
Net other comprehensive income during the period	15		38
Balance at end of period	150		150
Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	102		132
Amounts arising during the period	(9)		77
Reclassifications from accumulated other comprehensive income	(6)		(122)
Net other comprehensive income during the period	(15)		(45)
Balance at end of period	87		87
Equity Investees Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	1		1
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	(1)		(1)
Net other comprehensive income during the period	(1)		(1)
Balance at end of period
Defined Benefit Plans Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(11)		(14)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	2		5
Net other comprehensive income during the period	2		5
Balance at end of period	(9)		(9)
Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(1,955)		(2,023)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	33		101
Net other comprehensive income during the period	33		101
Balance at end of period	(1,922)		(1,922)
Defined Benefit Plans Transition Assset Obligation [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	1		1
Amounts arising during the period
Reclassifications from accumulated other comprehensive income
Net other comprehensive income during the period
Balance at end of period	1		1
PPL Energy Supply LLC [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	14		48
Amounts arising during the period	15		40
Reclassifications from accumulated other comprehensive income	(25)		(84)
Net other comprehensive income during the period	(10)	(77)	(44)	(257)
Balance at end of period	4		4
PPL Energy Supply LLC [Member] | Available For Sale Securities Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	135		112
Amounts arising during the period	15		40
Reclassifications from accumulated other comprehensive income			(2)
Net other comprehensive income during the period	15		38
Balance at end of period	150		150
PPL Energy Supply LLC [Member] | Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	144		211
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	(29)		(96)
Net other comprehensive income during the period	(29)		(96)
Balance at end of period	115		115
PPL Energy Supply LLC [Member] | Defined Benefit Plans Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(8)		(10)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	1		3
Net other comprehensive income during the period	1		3
Balance at end of period	(7)		(7)
PPL Energy Supply LLC [Member] | Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(257)		(265)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	3		11
Net other comprehensive income during the period	3		11
Balance at end of period	(254)		(254)
PPL Energy Supply LLC [Member] | Defined Benefit Plans Transition Assset Obligation [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period
Amounts arising during the period
Reclassifications from accumulated other comprehensive income
Net other comprehensive income during the period
Balance at end of period