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Summary of Significant Accounting Policies (Details) - Alternative Electricity Suppliers [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accounts Receivable (Numeric) [Abstract] |  |  |  |
Purchases of accounts receivable | $ 324 | $ 365 | $ 968 | $ 1,000
PPL Electric Utilities Corp [Member] |  |  |  |
Accounts Receivable (Numeric) [Abstract] |  |  |  |
Purchases of accounts receivable | $ 324 | $ 365 | $ 968 | $ 1,000

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- References No definition available. + Details
Name: | ppl_AccountsReceivableNumericAbstract
Namespace Prefix: | ppl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents purchases, under a PUC-approved program, of certain accounts receivable from alternative provider of last resort suppliers at a nominal discount, which reflects a provision for uncollectible accounts. + References No definition available. + Details
Name: | ppl_PurchasesOfAccountsReceivable
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_CounterpartyNameAxis=ppl_UnaffiliatedThirdPartyEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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