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Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period $ (2,274) $ (1,565) $ (1,940)
Amounts arising during the period (575) (754) 323
Reclassifications from accumulated other comprehensive income 145 45 52
Net other comprehensive income during the period (430) (709) 375
Distribution of PPL Energy Supply (24)    
Balance at end of period (2,728) (2,274) (1,565)
Foreign Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period (286) (11) (149)
Amounts arising during the period (234) (275) 138
Reclassifications from accumulated other comprehensive income 0 0 0
Net other comprehensive income during the period (234) (275) 138
Distribution of PPL Energy Supply 0    
Balance at end of period (520) (286) (11)
Available For Sale Securities Unrealized Gains (Losses) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period 201 172 111
Amounts arising during the period 8 35 67
Reclassifications from accumulated other comprehensive income (2) (6) (6)
Net other comprehensive income during the period 6 29 61
Distribution of PPL Energy Supply (207)    
Balance at end of period 0 201 172
Qualifying Derivatives Unrealized Gains (Losses) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period 20 94 132
Amounts arising during the period 26 (10) 45
Reclassifications from accumulated other comprehensive income 2 (64) (83)
Net other comprehensive income during the period 28 (74) (38)
Distribution of PPL Energy Supply (55)    
Balance at end of period (7) 20 94
Equity Investees Accumulated Other Comprehensive Income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period 1 1 1
Amounts arising during the period 0 0 0
Reclassifications from accumulated other comprehensive income (1) 0 0
Net other comprehensive income during the period (1) 0 0
Distribution of PPL Energy Supply 0    
Balance at end of period 0 1 1
Defined Benefit Plans Prior Service Costs [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period 3 (6) (14)
Amounts arising during the period (9) 5 2
Reclassifications from accumulated other comprehensive income 0 4 6
Net other comprehensive income during the period (9) 9 8
Distribution of PPL Energy Supply 0    
Balance at end of period (6) 3 (6)
Defined Benefit Plans Actuarial Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period (2,213) (1,815) (2,021)
Amounts arising during the period (366) (509) 71
Reclassifications from accumulated other comprehensive income 146 111 135
Net other comprehensive income during the period (220) (398) 206
Distribution of PPL Energy Supply 238    
Balance at end of period (2,195) (2,213) (1,815)
LG And E And KU Energy LLC [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of period   13 (15)
Amounts arising during the period (7) (57) 28
Reclassifications from accumulated other comprehensive income 6 (1)  
Net other comprehensive income during the period (1) (58) 28
Balance at end of period     13
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 1
Amounts arising during the period 0 0 0
Reclassifications from accumulated other comprehensive income 0 (1)  
Net other comprehensive income during the period 0 (1) 0
Balance at end of period 0 0 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 (8) (2) (2)
Amounts arising during the period (3) (7) 0
Reclassifications from accumulated other comprehensive income 1 1  
Net other comprehensive income during the period (2) (6) 0
Balance at end of period (10) (8) (2)
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 (37) 14 (14)
Amounts arising during the period (4) (50) 28
Reclassifications from accumulated other comprehensive income 5 (1)  
Net other comprehensive income during the period 1 (51) 28
Balance at end of period $ (36) $ (37) $ 14