Utility Rate Regulation Utility Rate Regulation (Other) (Detail (Details) - Unaffiliated Third Party Entity [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
PPL Electric [Member]
Purchases Of Accounts Receivable [Line Items]
Purchases of Accounts Receivable	$ 297	$ 288	$ 673	$ 644
PPL Electric Utilities Corp [Member]
Purchases Of Accounts Receivable [Line Items]
Purchases of Accounts Receivable	$ 297	$ 288	$ 673	$ 644

Accounts receivable purchased under a Public Utility Commission-approved program whereby certain accounts receivable are purchased and recorded at fair value from affiliated or unaffiliated alternative suppliers at a nominal discount.

No definition available.

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Period Type:	duration