Accumulated Other Comprehensive Income (Loss) - After-tax Changes by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (2,857)	$ (2,284)	$ (2,728)	$ (2,274)
Amounts arising during the period	(585)	33	(784)	(36)
Reclassifications from accumulated other comprehensive income	(38)	45	32	128
Net other comprehensive income during the period	(623)	78	(752)	92
Distribution of PPL Energy Supply				(24)
Balance at end of period	(3,480)	(2,206)	(3,480)	(2,206)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(716)	(435)	(520)	(286)
Amounts arising during the period	(641)	52	(837)	(97)
Reclassifications from accumulated other comprehensive income	0	0	0	0
Net other comprehensive income during the period	(641)	52	(837)	(97)
Distribution of PPL Energy Supply				0
Balance at end of period	(1,357)	(383)	(1,357)	(383)
Available For Sale Securities Unrealized Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	0	0	202
Amounts arising during the period	0	0	0	7
Reclassifications from accumulated other comprehensive income	0	0	0	(2)
Net other comprehensive income during the period	0	0	0	5
Distribution of PPL Energy Supply				(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)	2	(7)	20
Amounts arising during the period	62	(19)	57	8
Reclassifications from accumulated other comprehensive income	(69)	10	(62)	20
Net other comprehensive income during the period	(7)	(9)	(5)	28
Distribution of PPL Energy Supply				(55)
Balance at end of period	(12)	(7)	(12)	(7)
Equity Investees Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1)	0	0	1
Amounts arising during the period	0	0	0	0
Reclassifications from accumulated other comprehensive income	0	0	(1)	(1)
Net other comprehensive income during the period	0	0	(1)	(1)
Distribution of PPL Energy Supply				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	(5)	(3)	(6)	3
Amounts arising during the period	0	0	0	(6)
Reclassifications from accumulated other comprehensive income	0	0	1	0
Net other comprehensive income during the period	0	0	1	(6)
Distribution of PPL Energy Supply				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	(2,130)	(1,848)	(2,195)	(2,214)
Amounts arising during the period	(6)	0	(4)	52
Reclassifications from accumulated other comprehensive income	31	35	94	111
Net other comprehensive income during the period	25	35	90	163
Distribution of PPL Energy Supply				238
Balance at end of period	(2,105)	(1,813)	(2,105)	(1,813)
LG And E And KU Energy LLC [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(43)	(52)	(46)	(45)
Amounts arising during the period	0	0	1	(8)
Reclassifications from accumulated other comprehensive income	1	1	3	2
Net other comprehensive income during the period	1	1	4	(6)
Balance at end of period	(42)	(51)	(42)	(51)
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	(1)	(1)	0	0
Amounts arising during the period	0	0	0	0
Reclassifications from accumulated other comprehensive income	0	0	(1)	(1)
Net other comprehensive income during the period	0	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	(9)	(7)	(10)	(8)
Amounts arising during the period	0	0	0	0
Reclassifications from accumulated other comprehensive income	0	0	1	1
Net other comprehensive income during the period	0	0	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	(33)	(44)	(36)	(37)
Amounts arising during the period	0	0	1	(8)
Reclassifications from accumulated other comprehensive income	1	1	3	2
Net other comprehensive income during the period	1	1	4	(6)
Balance at end of period	$ (32)	$ (43)	$ (32)	$ (43)