Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 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 period ended March 31, 2018.

	Three Months
	PPL			PPL Electric			LKE			LG&E			KU
Operating Revenues (a)	$	2,126		$	639		$	872		$	419		$	471
Revenues derived from:
Alternative revenue programs (b)	32			2			30			14			16
Other (c)	(16		)	(4		)	(5		)	(1		)	(4		)
Revenues from Contracts with Customers	$	2,142		$	637		$	897		$	432		$	483

(a) PPL includes $615 million 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 3 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 period ended March 31, 2018.

	Three Months
	PPL		PPL Electric		LKE		LG&E		KU
Licensed energy suppliers (a)	$	584	$	—	$	—	$	—	$	—
Residential	804		408		396		197		199
Commercial	325		98		227		124		103
Industrial	155		13		142		44		98
Other (b)	105		13		68		31		37
Wholesale - municipal	30		—		30		—		30
Wholesale - other (c)	34		—		34		36		16
Transmission	105		105		—		—		—
Revenues from Contracts with Customers	$	2,142	$	637	$	897	$	432	$	483

(a) Represents customers of WPD.

(b) Primarily includes revenues from pole attachments, street lighting and other public authorities.

(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 Contracts with Customers [Table Text Block]

The following table shows the accounts receivable balances that were impaired for the period ended March 31, 2018.

	Three Months
PPL	$	10
PPL Electric	7
LKE	2
LG&E	1
KU	1

Contract with Customer, Asset and Liability [Table Text Block]

The following table shows the balances and certain activity 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 March 31, 2018	20		11		7		3		4
Revenue recognized during the period that was included in the opening contract liability balance	17		8		8		4		4