Summary of Significant Accounting Policies (Details) - Alternative Electricity Suppliers [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
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

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.

No definition available.

Name:	ppl_PurchasesOfAccountsReceivable
Namespace Prefix:	ppl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration