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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated Other Comprehensive Income (Loss)
The after-tax changes in AOCI by component for the years ended December 31 were as follows: 

 
 
 
Unrealized gains (losses)
 
 
 
Defined benefit plans
 
 
 
Foreign
currency
translation
adjustments
 
Available-
for-sale
securities
 
Qualifying
derivatives
 
Equity
investees'
AOCI
 
Prior
service
costs
 
Actuarial
gain
(loss)
 
Total
PPL
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
$
(286
)
 
$
201

 
$
20

 
$
1

 
$
3

 
$
(2,213
)
 
$
(2,274
)
Amounts arising during the year
(234
)
 
8

 
26

 
—

 
(9
)
 
(366
)
 
(575
)
Reclassifications from AOCI
—

 
(2
)
 
2

 
(1
)
 
—

 
146

 
145

Net OCI during the year
(234
)
 
6

 
28

 
(1
)
 
(9
)
 
(220
)
 
(430
)
Distribution of PPL Energy
Supply (See Note 8)
—

 
(207
)
 
(55
)
 
—

 
—

 
238

 
(24
)
December 31, 2015
$
(520
)
 
$
—

 
$
(7
)
 
$
—

 
$
(6
)
 
$
(2,195
)
 
$
(2,728
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts arising during the year
(1,107
)
 
—

 
91

 
—

 
(3
)
 
(61
)
 
(1,080
)
Reclassifications from AOCI
—

 
—

 
(91
)
 
(1
)
 
1

 
121

 
30

Net OCI during the year
(1,107
)
 
—

 
—

 
(1
)
 
(2
)
 
60

 
(1,050
)
December 31, 2016
$
(1,627
)
 
$
—

 
$
(7
)
 
$
(1
)
 
$
(8
)
 
$
(2,135
)
 
$
(3,778
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts arising during the year
538

 
—

 
(79
)
 
—

 
—

 
(308
)
 
151

Reclassifications from AOCI
—

 
—

 
73

 
1

 
1

 
130

 
205

Net OCI during the year
538

 
—

 
(6
)
 
1

 
1

 
(178
)
 
356

December 31, 2017
$
(1,089
)
 
$
—

 
$
(13
)
 
$
—

 
$
(7
)
 
$
(2,313
)
 
$
(3,422
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
LKE
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
 

 
 

 
 

 
$
—

 
$
(8
)
 
$
(37
)
 
$
(45
)
Amounts arising during the year
 

 
 

 
 

 
—

 
(3
)
 
(4
)
 
(7
)
Reclassifications from AOCI
 
 
 
 
 
 
—

 
1

 
5

 
6

Net OCI during the year
 

 
 

 
 

 
—

 
(2
)
 
1

 
(1
)
December 31, 2015
 

 
 

 
 

 
$
—

 
$
(10
)
 
$
(36
)
 
$
(46
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts arising during the year
 

 
 

 
 

 
—

 
—

 
(27
)
 
(27
)
Reclassifications from AOCI
 

 
 

 
 

 
(1
)
 
2

 
2

 
3

Net OCI during the year
 

 
 

 
 

 
(1
)
 
2

 
(25
)
 
(24
)
December 31, 2016
 

 
 

 
 

 
$
(1
)
 
$
(8
)
 
$
(61
)
 
$
(70
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts arising during the year
 
 
 

 
 

 
—

 
(2
)
 
(23
)
 
(25
)
Reclassifications from AOCI
 

 
 

 
 

 
1

 
1

 
5

 
7

Net OCI during the year
 

 
 

 
 

 
1

 
(1
)
 
(18
)
 
(18
)
December 31, 2017
 

 
 

 
 

 
$
—

 
$
(9
)
 
$
(79
)
 
$
(88
)
Reclassification out of Other Comprehensive Income (Loss)
The following table presents PPL's gains (losses) and related income taxes for reclassifications from AOCI for the years ended December 31, 2017, 2016 and 2015.

 
 
PPL
 
 
Details about AOCI
 
2017
 
2016
 
2015
 
Affected Line Item on the
Statements of Income
Available-for-sale securities
 
$
—

 
$
—

 
$
4

 
Other Income (Expense) - net
Total Pre-tax
 
—

 
—

 
4

 
 
Income Taxes
 
—

 
—

 
(2
)
 
 
Total After-tax
 
—

 
—

 
2

 
 
 
 
 
 
 
 
 
 
 
Qualifying derivatives
 
 
 
 
 
 
 
 
Interest rate swaps
 
(9
)
 
(7
)
 
(11
)
 
Interest Expense
 
 
—

 
—

 
(77
)
 
Discontinued operations
Cross-currency swaps
 
(82
)
 
116

 
49

 
Other Income (Expense) - net
 
 
—

 
3

 
2

 
Interest Expense
Commodity contracts
 
—

 
—

 
20

 
Discontinued operations
Total Pre-tax
 
(91
)
 
112

 
(17
)
 
 
Income Taxes
 
18

 
(21
)
 
15

 
 
Total After-tax
 
(73
)
 
91

 
(2
)
 
 
 
 
 
 
 
 
 
 
 
Equity Investees' AOCI
 
(1
)
 
1

 
1

 
Other Income (Expense) - net
Total Pre-tax
 
(1
)
 
1

 
1

 
 
Income Taxes
 
—

 
—

 
—

 
 
Total After-tax
 
(1
)
 
1

 
1

 
 
 
 
 
 
 
 
 
 
 
Defined benefit plans
 
 
 
 
 
 
 
 
Prior service costs
 
(2
)
 
(2
)
 
—

 
 
Net actuarial loss
 
(167
)
 
(156
)
 
(192
)
 
 
Total Pre-tax
 
(169
)
 
(158
)
 
(192
)
 
 
Income Taxes
 
38

 
36

 
46

 
 
Total After-tax
 
(131
)
 
(122
)
 
(146
)
 
 
Total reclassifications during the year
 
$
(205
)
 
$
(30
)
 
$
(145
)
 
 
LG And E And KU Energy LLC [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated Other Comprehensive Income (Loss)
The after-tax changes in AOCI by component for the years ended December 31 were as follows: 

 
 
 
Unrealized gains (losses)
 
 
 
Defined benefit plans
 
 
 
Foreign
currency
translation
adjustments
 
Available-
for-sale
securities
 
Qualifying
derivatives
 
Equity
investees'
AOCI
 
Prior
service
costs
 
Actuarial
gain
(loss)
 
Total
PPL
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
$
(286
)
 
$
201

 
$
20

 
$
1

 
$
3

 
$
(2,213
)
 
$
(2,274
)
Amounts arising during the year
(234
)
 
8

 
26

 
—

 
(9
)
 
(366
)
 
(575
)
Reclassifications from AOCI
—

 
(2
)
 
2

 
(1
)
 
—

 
146

 
145

Net OCI during the year
(234
)
 
6

 
28

 
(1
)
 
(9
)
 
(220
)
 
(430
)
Distribution of PPL Energy
Supply (See Note 8)
—

 
(207
)
 
(55
)
 
—

 
—

 
238

 
(24
)
December 31, 2015
$
(520
)
 
$
—

 
$
(7
)
 
$
—

 
$
(6
)
 
$
(2,195
)
 
$
(2,728
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts arising during the year
(1,107
)
 
—

 
91

 
—

 
(3
)
 
(61
)
 
(1,080
)
Reclassifications from AOCI
—

 
—

 
(91
)
 
(1
)
 
1

 
121

 
30

Net OCI during the year
(1,107
)
 
—

 
—

 
(1
)
 
(2
)
 
60

 
(1,050
)
December 31, 2016
$
(1,627
)
 
$
—

 
$
(7
)
 
$
(1
)
 
$
(8
)
 
$
(2,135
)
 
$
(3,778
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts arising during the year
538

 
—

 
(79
)
 
—

 
—

 
(308
)
 
151

Reclassifications from AOCI
—

 
—

 
73

 
1

 
1

 
130

 
205

Net OCI during the year
538

 
—

 
(6
)
 
1

 
1

 
(178
)
 
356

December 31, 2017
$
(1,089
)
 
$
—

 
$
(13
)
 
$
—

 
$
(7
)
 
$
(2,313
)
 
$
(3,422
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
LKE
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
 

 
 

 
 

 
$
—

 
$
(8
)
 
$
(37
)
 
$
(45
)
Amounts arising during the year
 

 
 

 
 

 
—

 
(3
)
 
(4
)
 
(7
)
Reclassifications from AOCI
 
 
 
 
 
 
—

 
1

 
5

 
6

Net OCI during the year
 

 
 

 
 

 
—

 
(2
)
 
1

 
(1
)
December 31, 2015
 

 
 

 
 

 
$
—

 
$
(10
)
 
$
(36
)
 
$
(46
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts arising during the year
 

 
 

 
 

 
—

 
—

 
(27
)
 
(27
)
Reclassifications from AOCI
 

 
 

 
 

 
(1
)
 
2

 
2

 
3

Net OCI during the year
 

 
 

 
 

 
(1
)
 
2

 
(25
)
 
(24
)
December 31, 2016
 

 
 

 
 

 
$
(1
)
 
$
(8
)
 
$
(61
)
 
$
(70
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amounts arising during the year
 
 
 

 
 

 
—

 
(2
)
 
(23
)
 
(25
)
Reclassifications from AOCI
 

 
 

 
 

 
1

 
1

 
5

 
7

Net OCI during the year
 

 
 

 
 

 
1

 
(1
)
 
(18
)
 
(18
)
December 31, 2017
 

 
 

 
 

 
$
—

 
$
(9
)
 
$
(79
)
 
$
(88
)