Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	$ (1,565)	$ (1,940)
Amounts arising during the period	90	(160)
Reclassifications from accumulated other comprehensive income	46	(46)
Net other comprehensive income during the period	136	(206)
Balance at end of period	(1,429)	(2,146)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(11)	(149)
Amounts arising during the period	131	(245)
Reclassifications from accumulated other comprehensive income
Net other comprehensive income during the period	131	(245)
Balance at end of period	120	(394)
Available For Sale Securities Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	173	112
Amounts arising during the period	5	23
Reclassifications from accumulated other comprehensive income	(1)	(1)
Net other comprehensive income during the period	4	22
Balance at end of period	177	134
Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	94	132
Amounts arising during the period	(46)	62
Reclassifications from accumulated other comprehensive income	19	(80)
Net other comprehensive income during the period	(27)	(18)
Balance at end of period	67	114
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	(6)	(14)
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	(5)	(13)
Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(1,817)	(2,023)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	27	34
Net other comprehensive income during the period	27	34
Balance at end of period	(1,790)	(1,989)
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	77	48
Amounts arising during the period	5	23
Reclassifications from accumulated other comprehensive income	(4)	(26)
Net other comprehensive income during the period	1	(3)
Balance at end of period	78	45
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	173	112
Amounts arising during the period	5	23
Reclassifications from accumulated other comprehensive income	(1)	(1)
Net other comprehensive income during the period	4	22
Balance at end of period	177	134
PPL Energy Supply LLC [Member] | Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	88	211
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	(5)	(30)
Net other comprehensive income during the period	(5)	(30)
Balance at end of period	83	181
PPL Energy Supply LLC [Member] | Defined Benefit Plans Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(4)	(10)
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	(3)	(9)
PPL Energy Supply LLC [Member] | Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(180)	(265)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	1	4
Net other comprehensive income during the period	1	4
Balance at end of period	(179)	(261)
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