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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	$ (1,429)	$ (2,146)	$ (1,565)	$ (1,940)
Amounts arising during the period	8	19	98	(141)
Reclassifications from accumulated other comprehensive income	23	(1)	69	(47)
Net other comprehensive income during the period	31	18	167	(188)
Balance at end of period	(1,398)	(2,128)	(1,398)	(2,128)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	120	(394)	(11)	(149)
Amounts arising during the period	(3)	(7)	128	(252)
Reclassifications from accumulated other comprehensive income
Net other comprehensive income during the period	(3)	(7)	128	(252)
Balance at end of period	117	(401)	117	(401)
Available For Sale Securities Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	177	134	173	112
Amounts arising during the period	14	2	19	25
Reclassifications from accumulated other comprehensive income	(1)	(1)	(2)	(2)
Net other comprehensive income during the period	13	1	17	23
Balance at end of period	190	135	190	135
Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	67	114	94	132
Amounts arising during the period	(1)	24	(47)	86
Reclassifications from accumulated other comprehensive income	(5)	(36)	14	(116)
Net other comprehensive income during the period	(6)	(12)	(33)	(30)
Balance at end of period	61	102	61	102
Equity Investees Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	1	1	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	1	1
Defined Benefit Plans Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(5)	(13)	(6)	(14)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	1	2	2	3
Net other comprehensive income during the period	1	2	2	3
Balance at end of period	(4)	(11)	(4)	(11)
Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(1,790)	(1,989)	(1,817)	(2,023)
Amounts arising during the period	(2)		(2)
Reclassifications from accumulated other comprehensive income	28	34	55	68
Net other comprehensive income during the period	26	34	53	68
Balance at end of period	(1,764)	(1,955)	(1,764)	(1,955)
Defined Benefit Plans Transition Assset Obligation [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	1	1	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	1	1
PPL Energy Supply LLC [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	78	45	77	48
Amounts arising during the period	14	2	19	25
Reclassifications from accumulated other comprehensive income	(7)	(33)	(11)	(59)
Net other comprehensive income during the period	7	(31)	8	(34)
Balance at end of period	85	14	85	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	177	134	173	112
Amounts arising during the period	14	2	19	25
Reclassifications from accumulated other comprehensive income	(1)	(1)	(2)	(2)
Net other comprehensive income during the period	13	1	17	23
Balance at end of period	190	135	190	135
PPL Energy Supply LLC [Member] | Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	83	181	88	211
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	(8)	(37)	(13)	(67)
Net other comprehensive income during the period	(8)	(37)	(13)	(67)
Balance at end of period	75	144	75	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	(3)	(9)	(4)	(10)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income		1	1	2
Net other comprehensive income during the period		1	1	2
Balance at end of period	(3)	(8)	(3)	(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	(179)	(261)	(180)	(265)
Amounts arising during the period
Reclassifications from accumulated other comprehensive income	2	4	3	8
Net other comprehensive income during the period	2	4	3	8
Balance at end of period	(177)	(257)	(177)	(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