XML 100 R61.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Revenue from Contracts with Customers (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Days | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 1,939 | $ 1,872 | $ 1,848 | $ 2,126 | $ 1,926 | $ 1,845 | $ 1,725 | $ 1,951 | $ 7,785 | $ 7,447 | $ 7,517
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |  |  |  |  |
Alternative Revenue Programs |  |  |  |  |  |  |  |  | 32 |  |
Other Revenue |  |  |  |  |  |  |  |  | (38) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 7,779 |  |
Credit loss from contract with customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Provision for Doubtful Accounts |  |  |  |  |  |  |  |  | 34 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |  |  |  |  |
Contract with Customer, Liability | 42 |  |  |  | 29 |  |  |  | 42 | 29 |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  | 21 |  |
Licensed energy supplier [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 2,127 |  |
Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 2,704 |  |
Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 1,233 |  |
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 624 |  |
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 489 |  |
Wholesale Municipal [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 118 |  |
Wholesale Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 79 |  |
Transmission [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 405 |  |
Pennsylvania Regulated [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 2,277 | 2,195 | 2,156
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 21 |  |
U.K. Regulated [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 2,268 | 2,091 | 2,207
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 14 |  |
Kentucky Regulated [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 3,214 | 3,156 | 3,141
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 22 |  |
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 26 | 5 | 13
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |  |  |  |  |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  | $ 37 |  |
PPL Electric [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 21 |  |
LGE [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 22 |  |
KU [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 22 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Amount | $ 49 |  |  |  |  |  |  |  | $ 49 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 12 months |  |  |  |  |  |  |  | 12 months |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 573 | $ 548 | $ 517 | $ 639 | 575 | $ 547 | $ 500 | $ 573 | $ 2,277 | 2,195 | 2,156
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 21 |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |  |  |  |  |
Alternative Revenue Programs |  |  |  |  |  |  |  |  | $ (6) |  |
Other Revenue |  |  |  |  |  |  |  |  | (12) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 2,259 |  |
Credit loss from contract with customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Provision for Doubtful Accounts |  |  |  |  |  |  |  |  | 24 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |  |  |  |  |
Contract with Customer, Liability | 23 |  |  |  | 19 |  |  |  | 23 | 19 |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  | 8 |  |
PPL Electric Utilities Corp [Member] | Licensed energy supplier [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 0 |  |
PPL Electric Utilities Corp [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 1,379 |  |
PPL Electric Utilities Corp [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 368 |  |
PPL Electric Utilities Corp [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 54 |  |
PPL Electric Utilities Corp [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 53 |  |
PPL Electric Utilities Corp [Member] | Wholesale Municipal [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 0 |  |
PPL Electric Utilities Corp [Member] | Wholesale Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 0 |  |
PPL Electric Utilities Corp [Member] | Distribution [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 1,900 |  |
PPL Electric Utilities Corp [Member] | Transmission [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 405 |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 3,214 | 3,156 | 3,141
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |  |  |  |  |
Alternative Revenue Programs |  |  |  |  |  |  |  |  | 38 |  |
Other Revenue |  |  |  |  |  |  |  |  | (17) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 3,235 |  |
Credit loss from contract with customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Provision for Doubtful Accounts |  |  |  |  |  |  |  |  | 9 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |  |  |  |  |
Contract with Customer, Liability | 9 |  |  |  | 8 |  |  |  | 9 | 8 |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  | 8 |  |
LG And E And KU Energy LLC [Member] | Licensed energy supplier [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 0 |  |
LG And E And KU Energy LLC [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 1,325 |  |
LG And E And KU Energy LLC [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 865 |  |
LG And E And KU Energy LLC [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 570 |  |
LG And E And KU Energy LLC [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 278 |  |
LG And E And KU Energy LLC [Member] | Wholesale Municipal [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 118 |  |
LG And E And KU Energy LLC [Member] | Wholesale Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 79 |  |
LG And E And KU Energy LLC [Member] | Transmission [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | $ 0 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 22 |  |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 22 |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 1,496 | 1,453 | 1,430
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 22 |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |  |  |  |  |
Alternative Revenue Programs |  |  |  |  |  |  |  |  | $ 12 |  |
Other Revenue |  |  |  |  |  |  |  |  | (5) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 1,503 |  |
Credit loss from contract with customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Provision for Doubtful Accounts |  |  |  |  |  |  |  |  | 4 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |  |  |  |  |
Contract with Customer, Liability | 5 |  |  |  | 4 |  |  |  | 5 | 4 |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  | 4 |  |
Louisville Gas And Electric Co [Member] | Licensed energy supplier [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 0 |  |
Louisville Gas And Electric Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 666 |  |
Louisville Gas And Electric Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 455 |  |
Louisville Gas And Electric Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 180 |  |
Louisville Gas And Electric Co [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 129 |  |
Louisville Gas And Electric Co [Member] | Wholesale Municipal [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 0 |  |
Louisville Gas And Electric Co [Member] | Wholesale Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 73 |  |
Louisville Gas And Electric Co [Member] | Transmission [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 0 |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 1,760 | 1,744 | $ 1,749
Number Of Days Due From Invoice Date | Days |  |  |  |  |  |  |  |  | 22 |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |  |  |  |  |
Alternative Revenue Programs |  |  |  |  |  |  |  |  | $ 26 |  |
Other Revenue |  |  |  |  |  |  |  |  | (12) |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 1,774 |  |
Credit loss from contract with customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Provision for Doubtful Accounts |  |  |  |  |  |  |  |  | 5 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |  |  |  |  |
Contract with Customer, Liability | $ 4 |  |  |  | $ 4 |  |  |  | 4 | $ 4 |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  | 4 |  |
Kentucky Utilities Co [Member] | Licensed energy supplier [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 0 |  |
Kentucky Utilities Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 659 |  |
Kentucky Utilities Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 410 |  |
Kentucky Utilities Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 390 |  |
Kentucky Utilities Co [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 149 |  |
Kentucky Utilities Co [Member] | Wholesale Municipal [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 118 |  |
Kentucky Utilities Co [Member] | Wholesale Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | 48 |  |
Kentucky Utilities Co [Member] | Transmission [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  |  |  |  | $ 0 |  |

X
- Definition Programs that enable the utility to adjust future rates (usually as a surcharge applied to future billings) in response to past activities or completed events. + References No definition available. + Details
Name: | ppl_AlternativeRevenuePrograms
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Credit loss from contract with customer [Abstract] + References No definition available. + Details
Name: | ppl_CreditlossfromcontractwithcustomerAbstract
Namespace Prefix: | ppl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Typical number of days outstanding amounts for services rendered are due from the invoice date. + References No definition available. + Details
Name: | ppl_NumberOfDaysDueFromInvoiceDate
Namespace Prefix: | ppl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Additional revenues outside the scope of revenues from contracts with customers - which could include, but doesn't have to include leases, late charges, returned checks or other miscellaneous revenues. + References No definition available. + Details
Name: | ppl_OtherRevenue
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reconciliation of revenue from contacts with customers [Abstract] + References No definition available. + Details
Name: | ppl_ReconciliationofrevenuefromcontactswithcustomersAbstract
Namespace Prefix: | ppl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Revenue from contracts with customers [Table] + References No definition available. + Details
Name: | ppl_RevenuefromcontractswithcustomersLineItems
Namespace Prefix: | ppl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ContractWithCustomerAssetAndLiabilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 + Details
Name: | us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_MajorCustomersAxis=ppl_LicensedenergysupplierMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=ppl_ResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=ppl_CommercialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=ppl_IndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=ppl_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=ppl_WholesaleMunicipalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=ppl_WholesaleOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=ppl_TransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ppl_PennsylvaniaRegulatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ppl_UnitedKingdomRegulatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ppl_KentuckyRegulatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ppl_ByCompanyAxis=ppl_PplElectricUtilitiesCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ppl_ByCompanyAxis=ppl_LouisvilleGasAndElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ppl_ByCompanyAxis=ppl_KentuckyUtilitiesCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis=2019-01-01
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ppl_PplElectricUtilitiesCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=ppl_DistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ppl_LGAndEAndKUEnergyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ppl_LouisvilleGasAndElectricCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ppl_KentuckyUtilitiesCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |