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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2016
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income taxes for the periods ended September 30 are as follows.
 
(PPL)
 
Three Months
 
Nine Months
 
2016
 
2015
 
2016
 
2015
Federal income tax on Income from Continuing Operations Before
Income Taxes at statutory tax rate - 35%
$
214

 
$
189

 
$
681

 
$
571

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
13

 
15

 
37

 
44

Valuation allowance adjustments
4

 
—

 
13

 
8

Impact of lower U.K. income tax rates
(37
)
 
(40
)
 
(136
)
 
(138
)
Federal and state tax reserve adjustments (a)
—

 
(9
)
 
—

 
(21
)
Enactment of the U.K. Finance Act 2016 (b)
(42
)
 
—

 
(42
)
 
—

Depreciation not normalized
—

 
—

 
(6
)
 
(4
)
Interest benefit on U.K. financing entities
(4
)
 
(4
)
 
(13
)
 
(15
)
Stock-based compensation (c)
(1
)
 
—

 
(12
)
 
—

Other
(8
)
 
(7
)
 
(12
)
 
(13
)
Total increase (decrease)
(75
)
 
(45
)
 
(171
)
 
(139
)
Total income taxes
$
139

 
$
144

 
$
510

 
$
432

 
(a)
During the three and nine months ended September 30, 2015, PPL recorded a $9 million tax benefit related to a planned amendment of a prior period tax return.

During the nine months ended September 30, 2015, PPL recorded a $12 million tax benefit to adjust the settled refund amount approved by the Joint Committee on Taxation for the open audit years 1998 - 2011.
(b)
The U.K. Finance Act 2016, enacted in September 2016, reduces the U.K. statutory income tax rate effective April 1, 2020 from 18% to 17%. As a result, PPL reduced its net deferred tax liabilities and recognized a deferred tax benefit during the three and nine months ended September 30, 2016.
(c)
During the three and nine months ended September 30, 2016, PPL recorded lower income tax expense related to the application of new stock-based compensation accounting guidance. See Note 2 for additional information.

PPL Electric Utilities Corp [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income taxes for the periods ended September 30 are as follows.

(PPL Electric)
 
 
 
 
 
 
 
 
Three Months
 
Nine Months
 
2016
 
2015
 
2016
 
2015
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
52

 
$
32

 
$
149

 
$
112

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
9

 
7

 
27

 
21

Depreciation not normalized
(2
)
 
(1
)
 
(5
)
 
(3
)
Stock-based compensation (a)
—

 
—

 
(7
)
 
—

Other
(1
)
 
(3
)
 
(2
)
 
—

Total increase (decrease)
6

 
3

 
13

 
18

Total income taxes
$
58

 
$
35

 
$
162

 
$
130


(a)
During the nine months ended September 30, 2016, PPL Electric recorded lower income tax expense related to the application of new stock-based compensation accounting guidance. See Note 2 for additional information.
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 September 30 are as follows.

(LKE)  
 
 
 
 
 
 
 
 
Three Months
 
Nine Months
 
2016
 
2015
 
2016
 
2015
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
74

 
$
68

 
$
189

 
$
172

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
8

 
7

 
20

 
18

Amortization of investment tax credit
(1
)
 
(1
)
 
(2
)
 
(2
)
Valuation allowance adjustments (a)
—

 
—

 
—

 
8

Stock-based compensation
(1
)
 
—

 
(2
)
 
—

Other
(1
)
 
(1
)
 
(3
)
 
(2
)
Total increase (decrease)
5

 
5

 
13

 
22

Total income taxes
$
79

 
$
73

 
$
202

 
$
194


(a)
Represents a valuation allowance against tax credits expiring in 2016 and 2017 that are more likely than not to expire before being utilized.
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 September 30 are as follows.

(LG&E)
 
 
 
 
 
 
 
 
Three Months
 
Nine Months
 
2016
 
2015
 
2016
 
2015
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
36

 
$
33

 
$
90

 
$
83

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
4

 
4

 
10

 
9

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

 
3

 
8

 
8

Total income taxes
$
39

 
$
36

 
$
98

 
$
91
Kentucky Utilities Co [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income taxes for the periods ended September 30 are as follows.

(KU)
 
 
 
 
 
 
 
 
Three Months
 
Nine Months
 
2016
 
2015
 
2016
 
2015
Federal income tax on Income Before Income Taxes at statutory tax rate - 35%
$
44

 
$
41

 
$
117

 
$
106

Increase (decrease) due to:
 

 
 

 
 

 
 

State income taxes, net of federal income tax benefit
5

 
4

 
12

 
11

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

 
3

 
11

 
9

Total income taxes
$
48

 
$
44

 
$
128

 
$
115