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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contracts with Customers [Line Items]  
Reconciliation of Revenue from Contracts with Customers [Table Text Block]
The following tables reconcile "Operating Revenues" included in each Registrant's Statement of Income with revenues generated from contracts with customers for the periods ended June 30, 2018.
 
Three Months
 
PPL
 
PPL Electric
 
LKE
 
LG&E
 
KU
Operating Revenues (a)
$
1,848

 
$
517

 
$
743

 
$
335

 
$
414

   Revenues derived from:
 
 
 
 
 
 
 
 
 
Alternative revenue programs (b)
9

 
—

 
9

 
6

 
3

Other (c)
(13
)
 
(2
)
 
(4
)
 
(2
)
 
(2
)
Revenues from Contracts with Customers
$
1,844

 
$
515

 
$
748

 
$
339

 
$
415


 
Six Months
 
PPL
 
PPL Electric
 
LKE
 
LG&E
 
KU
Operating Revenues (a)
$
3,974

 
$
1,156

 
$
1,615

 
$
754

 
$
885

   Revenues derived from:
 
 
 
 
 
 
 
 
 
Alternative revenue programs (b)
41

 
2

 
39

 
20

 
19

Other (c)
(28
)
 
(6
)
 
(9
)
 
(3
)
 
(6
)
Revenues from Contracts with Customers
$
3,987

 
$
1,152

 
$
1,645

 
$
771

 
$
898


(a)
PPL includes $584 million and $1,199 million for the three and six months ended June 30, 2018 of revenues from external customers reported by the U.K. Regulated segment. PPL Electric and LKE represent revenues from external customers reported by the Pennsylvania Regulated and Kentucky Regulated segments. See Note 3 for additional information.
(b)
Alternative revenue programs for PPL Electric include the over/under-collection of its transmission formula rate. Alternative revenue programs for LKE, LG&E and KU include the over/under collection for the ECR and DSM programs as well as LG&E's over/under collection of its GLT program and KU's over/under collection of its generation formula rate. Over-collections of revenue are shown as positive amounts in the table above; under-collections are shown as negative amounts.
(c)
Represents additional revenues outside the scope of revenues from contracts with customers such as leases and other miscellaneous revenues.
Disaggregation of Revenue [Table Text Block]

The following tables show revenues from contracts with customers disaggregated by customer class for the periods ended June 30, 2018.
 
Three Months
 
PPL
 
PPL Electric
 
LKE
 
LG&E
 
KU
Licensed energy suppliers (a)
$
547

 
$
—

 
$
—

 
$
—

 
$
—

Residential
588

 
300

 
288

 
146

 
142

Commercial
296

 
89

 
207

 
107

 
100

Industrial
155

 
12

 
143

 
45

 
98

Other (b)
114

 
13

 
67

 
30

 
37

Wholesale - municipal
31

 
—

 
31

 
—

 
31

Wholesale - other (c)
12

 
—

 
12

 
11

 
7

Transmission
101

 
101

 
—

 
—

 
—

Revenues from Contracts with Customers
$
1,844

 
$
515

 
$
748

 
$
339

 
$
415


 
Six Months
 
PPL
 
PPL Electric
 
LKE
 
LG&E
 
KU
Licensed energy suppliers (a)
$
1,131

 
$
—

 
$
—

 
$
—

 
$
—

Residential
1,392

 
708

 
684

 
343

 
341

Commercial
621

 
187

 
434

 
231

 
203

Industrial
310

 
25

 
285

 
89

 
196

Other (b)
220

 
26

 
135

 
61

 
74

Wholesale - municipal
61

 
—

 
61

 
—

 
61

Wholesale - other (c)
46

 
—

 
46

 
47

 
23

Transmission
206

 
206

 
—

 
—

 
—

Revenues from Contracts with Customers
$
3,987

 
$
1,152

 
$
1,645

 
$
771

 
$
898


(a)
Represents customers of WPD.
(b)
Primarily includes revenues from pole attachments, street lighting and other public authorities.
(c)
Includes wholesale power and transmission revenues. LG&E and KU amounts include intercompany power sales and transmission revenues, which are eliminated upon consolidation at LKE.
Credit Loss Recognized from Contracts with Customers [Table Text Block]
The following table shows the accounts receivable balances that were impaired for the periods ended June 30, 2018.
 
Three Months
 
Six Months
PPL
$
3

 
$
13

PPL Electric
3

 
10

LKE
1

 
3

LG&E
—

 
1

KU
1

 
2
Contract with Customer, Asset and Liability [Table Text Block]
The following table shows the balances of contract liabilities resulting from contracts with customers.
 
PPL
 
PPL Electric
 
LKE
 
LG&E
 
KU
Contract liabilities as of December 31, 2017
$
29

 
$
19

 
$
8

 
$
4

 
$
4

Contract liabilities as of June 30, 2018
38

 
14

 
8

 
4

 
3
Contract With Customer Liability Revenue Recognized [Table Text Block]
The following table shows the revenue recognized during the period ended June 30, 2018 that was included in the contract liability balance at December 31, 2017.

 
Six Months
PPL
$
18

PPL Electric
8

LKE
8

LG&E
4

KU
4