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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income taxes for the periods ended June 30 are as follows.
(PPL)
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
129

 
$
236

 
$
315

 
$
467

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
10

 
9

 
23

 
22

Valuation allowance adjustments
—

 
3

 
5

 
9

Impact of lower U.K. income tax rates
(40
)
 
(45
)
 
(88
)
 
(99
)
U.S. income tax on foreign earnings - net of foreign tax credit (a)
(7
)
 
—

 
(16
)
 
(2
)
Impact of the U.K. Finance Acts
(6
)
 
(2
)
 
(9
)
 
(2
)
Depreciation not normalized
(2
)
 
(3
)
 
(5
)
 
(4
)
Interest benefit on U.K. financing entities
(4
)
 
(4
)
 
(8
)
 
(9
)
Stock-based compensation
(4
)
 
(3
)
 
(7
)
 
(11
)
Other
—

 
1

 
(5
)
 
—

Total increase (decrease)
(53
)
 
(44
)
 
(110
)
 
(96
)
Total income taxes
$
76

 
$
192

 
$
205

 
$
371



(a)
Lower income taxes primarily due to the tax benefit of accelerated pension contributions made in the first quarter of 2017. The related tax benefit is recognized over the annual period as a result of utilizing an estimated annual effective tax rate.
PPL Electric Utilities Corp [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income taxes for the periods ended June 30 are as follows.

(PPL Electric)
 
 
 
 
 
 
 
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
44

 
$
44

 
$
88

 
$
97

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
9

 
8

 
17

 
18

Depreciation not normalized
(2
)
 
(2
)
 
(4
)
 
(3
)
Stock-based compensation
(3
)
 
(2
)
 
(5
)
 
(7
)
Other
(1
)
 
—

 
(1
)
 
(1
)
Total increase (decrease)
3

 
4

 
7

 
7

Total income taxes
$
47

 
$
48

 
$
95

 
$
104
LG And E And KU Energy LLC [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income taxes for the periods ended June 30 are as follows.

(LKE)  
 
 
 
 
 
 
 
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
49

 
$
47

 
$
107

 
$
114

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
5

 
5

 
11

 
12

Other
(1
)
 
(1
)
 
(2
)
 
(3
)
Total increase (decrease)
4

 
4

 
9

 
9

Total income taxes
$
53

 
$
51

 
$
116

 
$
123
Louisville Gas And Electric Co [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income taxes for the periods ended June 30 are as follows.

(LG&E)
 
 
 
 
 
 
 
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
24

 
$
22

 
$
55

 
$
54

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
3

 
2

 
6

 
6

Other
—

 
—

 
(1
)
 
(1
)
Total increase (decrease)
3

 
2

 
5

 
5

Total income taxes
$
27

 
$
24

 
$
60

 
$
59
Kentucky Utilities Co [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income taxes for the periods ended June 30 are as follows.

(KU)
 
 
 
 
 
 
 
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
32

 
$
31

 
$
67

 
$
73

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
3

 
3

 
7

 
7

Other
(1
)
 
—

 
(1
)
 
—

Total increase (decrease)
2

 
3

 
6

 
7

Total income taxes
$
34

 
$
34

 
$
73

 
$
80