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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows.
 
PPL
 
LKE
 
LG&E
 
KU
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
ARO at beginning of period
$
586

 
$
336

 
$
535

 
$
285

 
$
175

 
$
74

 
$
360

 
$
211

Accretion
24

 
19

 
22

 
18

 
7

 
5

 
15

 
13

Obligations incurred
—

 
5

 
—

 
5

 
—

 
3

 
—

 
2

Changes in estimated timing or cost
(84
)
 
235

 
(95
)
 
234

 
(19
)
 
98

 
(76
)
 
136

Effect of foreign currency exchange rates
(9
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(29
)
 
(7
)
 
(29
)
 
(7
)
 
(18
)
 
(5
)
 
(11
)
 
(2
)
ARO at end of period
$
488

 
$
586

 
$
433

 
$
535

 
$
145

 
$
175

 
$
288

 
$
360
LG And E And KU Energy LLC [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows.
 
PPL
 
LKE
 
LG&E
 
KU
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
ARO at beginning of period
$
586

 
$
336

 
$
535

 
$
285

 
$
175

 
$
74

 
$
360

 
$
211

Accretion
24

 
19

 
22

 
18

 
7

 
5

 
15

 
13

Obligations incurred
—

 
5

 
—

 
5

 
—

 
3

 
—

 
2

Changes in estimated timing or cost
(84
)
 
235

 
(95
)
 
234

 
(19
)
 
98

 
(76
)
 
136

Effect of foreign currency exchange rates
(9
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(29
)
 
(7
)
 
(29
)
 
(7
)
 
(18
)
 
(5
)
 
(11
)
 
(2
)
ARO at end of period
$
488

 
$
586

 
$
433

 
$
535

 
$
145

 
$
175

 
$
288

 
$
360
Louisville Gas And Electric Co [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows.
 
PPL
 
LKE
 
LG&E
 
KU
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
ARO at beginning of period
$
586

 
$
336

 
$
535

 
$
285

 
$
175

 
$
74

 
$
360

 
$
211

Accretion
24

 
19

 
22

 
18

 
7

 
5

 
15

 
13

Obligations incurred
—

 
5

 
—

 
5

 
—

 
3

 
—

 
2

Changes in estimated timing or cost
(84
)
 
235

 
(95
)
 
234

 
(19
)
 
98

 
(76
)
 
136

Effect of foreign currency exchange rates
(9
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(29
)
 
(7
)
 
(29
)
 
(7
)
 
(18
)
 
(5
)
 
(11
)
 
(2
)
ARO at end of period
$
488

 
$
586

 
$
433

 
$
535

 
$
145

 
$
175

 
$
288

 
$
360
Kentucky Utilities Co [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows.
 
PPL
 
LKE
 
LG&E
 
KU
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
ARO at beginning of period
$
586

 
$
336

 
$
535

 
$
285

 
$
175

 
$
74

 
$
360

 
$
211

Accretion
24

 
19

 
22

 
18

 
7

 
5

 
15

 
13

Obligations incurred
—

 
5

 
—

 
5

 
—

 
3

 
—

 
2

Changes in estimated timing or cost
(84
)
 
235

 
(95
)
 
234

 
(19
)
 
98

 
(76
)
 
136

Effect of foreign currency exchange rates
(9
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(29
)
 
(7
)
 
(29
)
 
(7
)
 
(18
)
 
(5
)
 
(11
)
 
(2
)
ARO at end of period
$
488

 
$
586

 
$
433

 
$
535

 
$
145

 
$
175

 
$
288

 
$
360