Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	$ (2,146)		$ (1,940)
Amounts arising during the period	19		(141)
Reclassifications from accumulated other comprehensive income	(1)		(47)
Net other comprehensive income during the period	18	(390)	(188)	(332)
Balance at end of period	(2,128)		(2,128)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(394)		(149)
Amounts arising during the period	(7)		(252)
Reclassifications from accumulated other comprehensive income
Net other comprehensive income during the period	(7)		(252)
Balance at end of period	(401)		(401)
Available For Sale Securities Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	134		112
Amounts arising during the period	2		25
Reclassifications from accumulated other comprehensive income	(1)		(2)
Net other comprehensive income during the period	1		23
Balance at end of period	135		135
Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	114		132
Amounts arising during the period	24		86
Reclassifications from accumulated other comprehensive income	(36)		(116)
Net other comprehensive income during the period	(12)		(30)
Balance at end of period	102		102
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
Net other comprehensive income during the period
Balance at end of period	1		1
Defined Benefit Plans Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(13)		(14)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	2		3
Net other comprehensive income during the period	2		3
Balance at end of period	(11)		(11)
Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(1,989)		(2,023)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	34		68
Net other comprehensive income during the period	34		68
Balance at end of period	(1,955)		(1,955)
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	45		48
Amounts arising during the period	2		25
Reclassifications from accumulated other comprehensive income	(33)		(59)
Net other comprehensive income during the period	(31)	(122)	(34)	(180)
Balance at end of period	14		14
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	134		112
Amounts arising during the period	2		25
Reclassifications from accumulated other comprehensive income	(1)		(2)
Net other comprehensive income during the period	1		23
Balance at end of period	135		135
PPL Energy Supply LLC [Member] | Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	181		211
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	(37)		(67)
Net other comprehensive income during the period	(37)		(67)
Balance at end of period	144		144
PPL Energy Supply LLC [Member] | Defined Benefit Plans Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(9)		(10)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	1		2
Net other comprehensive income during the period	1		2
Balance at end of period	(8)		(8)
PPL Energy Supply LLC [Member] | Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(261)		(265)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	4		8
Net other comprehensive income during the period	4		8
Balance at end of period	(257)		(257)
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