Accumulated Other Comprehensive Income (Loss) - After-tax Changes by Component (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (3,159)	$ (2,311)	$ (2,728)	$ (2,274)
Amounts arising during the period	185	(13)	(199)	(69)
Reclassifications from accumulated other comprehensive income	117	64	70	83
Net other comprehensive income during the period	302	51	(129)	14
Distribution of PPL Energy Supply		(24)		(24)
Balance at end of period	(2,857)	(2,284)	(2,857)	(2,284)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(984)	(352)	(520)	(286)
Amounts arising during the period	268	(83)	(196)	(149)
Reclassifications from accumulated other comprehensive income	0	0	0	0
Net other comprehensive income during the period	268	(83)	(196)	(149)
Distribution of PPL Energy Supply		0		0
Balance at end of period	(716)	(435)	(716)	(435)
Available For Sale Securities Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	206	0	202
Amounts arising during the period	0	2	0	7
Reclassifications from accumulated other comprehensive income	0	(1)	0	(2)
Net other comprehensive income during the period	0	1	0	5
Distribution of PPL Energy Supply		(207)		(207)
Balance at end of period	0	0	0	0
Qualifying Derivatives Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(5)	9	(7)	20
Amounts arising during the period	(85)	21	(5)	27
Reclassifications from accumulated other comprehensive income	85	27	7	10
Net other comprehensive income during the period	0	48	2	37
Distribution of PPL Energy Supply		(55)		(55)
Balance at end of period	(5)	2	(5)	2
Equity Investees Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	0	0	1
Amounts arising during the period	0	0	0	0
Reclassifications from accumulated other comprehensive income	(1)	0	(1)	(1)
Net other comprehensive income during the period	(1)	0	(1)	(1)
Distribution of PPL Energy Supply		0		0
Balance at end of period	(1)	0	(1)	0
Defined Benefit Plans Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(6)	3	(6)	3
Amounts arising during the period	0	(6)	0	(6)
Reclassifications from accumulated other comprehensive income	1	0	1	0
Net other comprehensive income during the period	1	(6)	1	(6)
Distribution of PPL Energy Supply		0		0
Balance at end of period	(5)	(3)	(5)	(3)
Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(2,164)	(2,177)	(2,195)	(2,214)
Amounts arising during the period	2	53	2	52
Reclassifications from accumulated other comprehensive income	32	38	63	76
Net other comprehensive income during the period	34	91	65	128
Distribution of PPL Energy Supply		238		238
Balance at end of period	(2,130)	(1,848)	(2,130)	(1,848)
LG And E And KU Energy LLC [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(45)	(45)	(46)	(45)
Amounts arising during the period	1	(8)	1	(8)
Reclassifications from accumulated other comprehensive income	1	1	2	1
Net other comprehensive income during the period	2	(7)	3	(7)
Balance at end of period	(43)	(52)	(43)	(52)
LG And E And KU Energy LLC [Member] | Equity Investees Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	(1)	0	0
Amounts arising during the period	0	0	0	0
Reclassifications from accumulated other comprehensive income	(1)	0	(1)	(1)
Net other comprehensive income during the period	(1)	0	(1)	(1)
Balance at end of period	(1)	(1)	(1)	(1)
LG And E And KU Energy LLC [Member] | Defined Benefit Plans Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(10)	(8)	(10)	(8)
Amounts arising during the period	0	0	0	0
Reclassifications from accumulated other comprehensive income	1	1	1	1
Net other comprehensive income during the period	1	1	1	1
Balance at end of period	(9)	(7)	(9)	(7)
LG And E And KU Energy LLC [Member] | Defined Benefit Plans Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(35)	(36)	(36)	(37)
Amounts arising during the period	1	(8)	1	(8)
Reclassifications from accumulated other comprehensive income	1	0	2	1
Net other comprehensive income during the period	2	(8)	3	(7)
Balance at end of period	$ (33)	$ (44)	$ (33)	$ (44)