Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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: 

	2016		2015		2014
Domestic electric and gas revenues (a)	$	5,297	$	5,239	$	5,209
U.K. operating revenues (b)	2,207		2,410		2,621
Domestic - other	13		20		22
Total	$	7,517	$	7,669	$	7,852

(a) Represents revenues from cost-based rate-regulated generation, transmission and/or distribution in Pennsylvania, Kentucky, Virginia and Tennessee, 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
2016	$	41	$	44	$	—		$	31	$	54
2015	44		49		(2		)	50		41
2014	43		49		—			48		44
PPL Electric
2016	$	16	$	35	$	—		$	23	$	28
2015	17		39		—			40		16
2014	18		34		—			35		17
LKE
2016	$	23	$	8	$	—		$	7	$	24
2015	25		9		(2		)	9		23
2014	22		14		—			11		25
LG&E
2016	$	1	$	2	$	1		$	2	$	2
2015	2		2		—			3		1
2014	2		5		(1		)	4		2
KU
2016	$	2	$	4	$	—		$	4	$	2
2015	2		5		—			5		2
2014	4		8		(3		)	7		2

(a) Primarily related to uncollectible accounts written off.

Schedule of Restricted Cash and Cash Equivalents

At December 31, the balances of restricted cash and cash equivalents included the following: 

	PPL				PPL Electric
	2016		2015		2016		2015
Low carbon network fund (a)	$	17	$	22	$	—	$	—
Other	9		11		2		2
Total	$	26	$	33	$	2	$	2

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

Capitalized Interest Costs

Capitalized interest, including the debt component of AFUDC for PPL, was as follows:

	PPL
2016	$	11
2015	11
2014	16

Weighted-average Rates of Depreciation

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

	2016		2015		2014
PPL	2.73	%	2.57	%	2.92	%
PPL Electric	2.63	%	2.46	%	2.46	%
LKE	3.69	%	3.69	%	3.80	%
LG&E	3.58	%	3.65	%	4.05	%
KU	3.77	%	3.71	%	3.63	%

Schedule of Utility Inventory

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

	PPL				LKE				LG&E				KU
	2016		2015		2016		2015		2016		2015		2016		2015
Fuel	$	158	$	168	$	158	$	168	$	60	$	71	$	98	$	97
Natural gas stored underground (a)	42		42		42		42		42		42		—		—
Materials and supplies	156		147		97		88		41		38		56		50
Total	$	356	$	357	$	297	$	298	$	143	$	151	$	154	$	147

(a) Natural gas stored underground is primarily held to serve retail customers.

PPL Electric Utilities Corp [Member]

Summary of Significant Accounting Policies [Line Items]

Schedule of Restricted Cash and Cash Equivalents

At December 31, the balances of restricted cash and cash equivalents included the following: 

	PPL				PPL Electric
	2016		2015		2016		2015
Low carbon network fund (a)	$	17	$	22	$	—	$	—
Other	9		11		2		2
Total	$	26	$	33	$	2	$	2

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

Intercompany tax receivables (payables)

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

	2016			2015
PPL Electric	$	13		$	56
LKE	1			(10		)
LG&E	(18		)	4
KU	(29		)	(5		)

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:

	2016			2015
PPL Electric	$	13		$	56
LKE	1			(10		)
LG&E	(18		)	4
KU	(29		)	(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
	2016		2015		2016		2015		2016		2015		2016		2015
Fuel	$	158	$	168	$	158	$	168	$	60	$	71	$	98	$	97
Natural gas stored underground (a)	42		42		42		42		42		42		—		—
Materials and supplies	156		147		97		88		41		38		56		50
Total	$	356	$	357	$	297	$	298	$	143	$	151	$	154	$	147

(a) Natural gas stored underground is primarily held to serve retail customers.

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:

	2016			2015
PPL Electric	$	13		$	56
LKE	1			(10		)
LG&E	(18		)	4
KU	(29		)	(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
	2016		2015		2016		2015		2016		2015		2016		2015
Fuel	$	158	$	168	$	158	$	168	$	60	$	71	$	98	$	97
Natural gas stored underground (a)	42		42		42		42		42		42		—		—
Materials and supplies	156		147		97		88		41		38		56		50
Total	$	356	$	357	$	297	$	298	$	143	$	151	$	154	$	147

(a) Natural gas stored underground is primarily held to serve retail customers.

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:

	2016			2015
PPL Electric	$	13		$	56
LKE	1			(10		)
LG&E	(18		)	4
KU	(29		)	(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
	2016		2015		2016		2015		2016		2015		2016		2015
Fuel	$	158	$	168	$	158	$	168	$	60	$	71	$	98	$	97
Natural gas stored underground (a)	42		42		42		42		42		42		—		—
Materials and supplies	156		147		97		88		41		38		56		50
Total	$	356	$	357	$	297	$	298	$	143	$	151	$	154	$	147

(a) Natural gas stored underground is primarily held to serve retail customers.