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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from contracts with customers [Line Items]  
Reconciliation of revenue from contracts with customers [Table Text Block]
The following table reconciles "Operating Revenues" included in each Registrant's Statement of Income with revenues generated from contracts with customers for the year ended December 31:
 
2018
 
PPL
 
PPL Electric
 
LKE
 
LG&E
 
KU
Operating Revenues (a)
$
7,785

 
$
2,277

 
$
3,214

 
$
1,496

 
$
1,760

   Revenues derived from:
 
 
 
 
 
 
 
 
 
Alternative revenue programs (b)
32

 
(6
)
 
38

 
12

 
26

Other (c)
(38
)
 
(12
)
 
(17
)
 
(5
)
 
(12
)
Revenues from Contracts with Customers
$
7,779

 
$
2,259

 
$
3,235

 
$
1,503

 
$
1,774


(a)
PPL includes $2.3 billion for the year ended December 31, 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 2 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 table shows revenues from contracts with customers disaggregated by customer class for the year ended December 31:
 
2018
 
PPL
 
PPL Electric
 
LKE
 
LG&E
 
KU
Licensed energy suppliers (a)
$
2,127

 
$
—

 
$
—

 
$
—

 
$
—

Residential
2,704

 
1,379

 
1,325

 
666

 
659

Commercial
1,233

 
368

 
865

 
455

 
410

Industrial
624

 
54

 
570

 
180

 
390

Other (b)
489

 
53

 
278

 
129

 
149

Wholesale - municipal
118

 
—

 
118

 
—

 
118

Wholesale - other (c)
79

 
—

 
79

 
73

 
48

Transmission
405

 
405

 
—

 
—

 
—

Revenues from Contracts with Customers
$
7,779

 
$
2,259

 
$
3,235

 
$
1,503

 
$
1,774


(a)
Represents customers of WPD.
(b)
Primarily includes revenues from pole attachments, street lighting, other public authorities and other non-core businesses.
(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 contract with customer [Table Text Block]
The following table shows the accounts receivable balances from contracts with customers that were impaired for the year ended December 31:
 
2018
PPL
$
34

PPL Electric
24

LKE
9

LG&E
4

KU
5
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 December 31, 2018
42

 
23

 
9

 
5

 
4
Contract With Customer Liability Revenue Recognized [Table Text Block]
The following table shows the revenue recognized in 2018 that was included in the contract liability balance at the beginning of the year.
 
2018
PPL
$
21

PPL Electric
8

LKE
8

LG&E
4

KU
4