Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Significant Accounting Policies [Line Items]

Schedule of Utility Revenue

For the years ended December 31, the Statements of Income "Operating Revenues" line item contains revenue from the following: 

	2018		2017		2016
Domestic electric and gas revenues (a)	$	5,491	$	5,351	$	5,297
U.K. operating revenues (b)	2,268		2,091		2,207
Domestic - other	26		5		13
Total	$	7,785	$	7,447	$	7,517

(a) Represents revenues from cost-based rate-regulated generation, transmission and/or distribution in Pennsylvania, Kentucky and Virginia, including regulated wholesale revenue.

(b) Primarily represents regulated electricity distribution revenues from the operation of WPD's distribution networks.

Schedule of Valuation and Qualifying Accounts Disclosure

The changes in the allowance for doubtful accounts were: 

			Additions
	Balance at Beginning of Period		Charged to Income		Charged to Other Accounts			Deductions (a)		Balance at End of Period
PPL
2018	$	51	$	41	$	3		$	39	$	56
2017	54		28		(1		)	30		51
2016	41		44		—			31		54
PPL Electric
2018	$	24	$	29	$	—		$	26	$	27
2017	28		18		—			22		24
2016	16		35		—			23		28
LKE
2018	$	25	$	10	$	3		$	11	$	27
2017	24		8		(1		)	6		25
2016	23		8		—			7		24
LG&E
2018	$	1	$	4	$	1		$	5	$	1
2017	2		2		(1		)	2		1
2016	1		2		1			2		2
KU
2018	$	1	$	5	$	2		$	6	$	2
2017	2		4		(1		)	4		1
2016	2		4		—			4		2

(a) Primarily related to uncollectible accounts written off.

Weighted-average Rates of Depreciation

Following are the weighted-average annual rates of depreciation, for regulated utility plant, for the years ended December 31:

	2018		2017		2016
PPL	2.77	%	2.65	%	2.73	%
PPL Electric	3.01	%	2.86	%	2.63	%
LKE	3.69	%	3.64	%	3.69	%
LG&E	3.63	%	3.63	%	3.58	%
KU	3.74	%	3.66	%	3.77	%

Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:

	PPL				LKE				LG&E				KU
	2018		2017		2018		2017		2018		2017		2018		2017
Fuel	$	98	$	107	$	98	$	107	$	42	$	45	$	56	$	62
Natural gas stored underground	41		43		41		43		41		43		—		—
Materials and supplies	164		170		109		104		44		43		65		61
Total	$	303	$	320	$	248	$	254	$	127	$	131	$	121	$	123

Schedule of Non-Service Benefits Costs (Credits)

The following provides the non-service cost components of net periodic benefits (costs) or credits presented in "Other Income (Expense) - net" in 2018 and reclassified from "Other operation and maintenance" to "Other Income (Expense) - net" in 2017 and 2016 on the Statements of Income as a result of the adoption.

	2018			2017			2016
PPL	$	257		$	167		$	112
PPL Electric	5			1			3
LKE	4			(5		)	(6		)
LG&E	(2		)	(5		)	(5		)
KU	3			(1		)	(2		)

Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow

The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows:

	PPL				PPL Electric
	December 31, 2018		December 31, 2017		December 31, 2018		December 31, 2017
Cash and cash equivalents	$	621	$	485	$	267	$	49
Restricted cash - current	3		3		2		2
Restricted cash - noncurrent (a)	19		23		—		—
Total Cash, Cash Equivalents and Restricted Cash	$	643	$	511	$	269	$	51

(a) Primarily consists of funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.

PPL Electric Utilities Corp [Member]

Summary of Significant Accounting Policies [Line Items]

Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded:

	2018			2017
PPL Electric	$	19		$	61
LKE	(16		)	(23		)
LG&E	—			—
KU	(5		)	—

Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow

The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows:

	PPL				PPL Electric
	December 31, 2018		December 31, 2017		December 31, 2018		December 31, 2017
Cash and cash equivalents	$	621	$	485	$	267	$	49
Restricted cash - current	3		3		2		2
Restricted cash - noncurrent (a)	19		23		—		—
Total Cash, Cash Equivalents and Restricted Cash	$	643	$	511	$	269	$	51

(a) Primarily consists of funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.

LG And E And KU Energy LLC [Member]

Summary of Significant Accounting Policies [Line Items]

Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded:

	2018			2017
PPL Electric	$	19		$	61
LKE	(16		)	(23		)
LG&E	—			—
KU	(5		)	—

Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:

	PPL				LKE				LG&E				KU
	2018		2017		2018		2017		2018		2017		2018		2017
Fuel	$	98	$	107	$	98	$	107	$	42	$	45	$	56	$	62
Natural gas stored underground	41		43		41		43		41		43		—		—
Materials and supplies	164		170		109		104		44		43		65		61
Total	$	303	$	320	$	248	$	254	$	127	$	131	$	121	$	123

Louisville Gas And Electric Co [Member]

Summary of Significant Accounting Policies [Line Items]

Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded:

	2018			2017
PPL Electric	$	19		$	61
LKE	(16		)	(23		)
LG&E	—			—
KU	(5		)	—

Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:

	PPL				LKE				LG&E				KU
	2018		2017		2018		2017		2018		2017		2018		2017
Fuel	$	98	$	107	$	98	$	107	$	42	$	45	$	56	$	62
Natural gas stored underground	41		43		41		43		41		43		—		—
Materials and supplies	164		170		109		104		44		43		65		61
Total	$	303	$	320	$	248	$	254	$	127	$	131	$	121	$	123

Kentucky Utilities Co [Member]

Summary of Significant Accounting Policies [Line Items]

Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded:

	2018			2017
PPL Electric	$	19		$	61
LKE	(16		)	(23		)
LG&E	—			—
KU	(5		)	—

Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:

	PPL				LKE				LG&E				KU
	2018		2017		2018		2017		2018		2017		2018		2017
Fuel	$	98	$	107	$	98	$	107	$	42	$	45	$	56	$	62
Natural gas stored underground	41		43		41		43		41		43		—		—
Materials and supplies	164		170		109		104		44		43		65		61
Total	$	303	$	320	$	248	$	254	$	127	$	131	$	121	$	123