Financing Activities (Credit Arrangements) (Details) £ in Millions, $ in Millions		1 Months Ended	12 Months Ended
		Jan. 31, 2017	Dec. 31, 2016 USD ($)	Dec. 31, 2016 GBP (£)		Nov. 28, 2016 GBP (£)	Dec. 31, 2015 USD ($)		Dec. 31, 2015 GBP (£)
PPL Electric [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Jan. 29, 2021
Capacity	[1],[2]		$ 650
Borrowed			0				$ 0
Letters of credit and commercial paper issued	[1],[2]		296				1
Unused capacity	[1],[2]		$ 354
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
PPL Electric [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
LKE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Oct. 30, 2018
Capacity	[1],[2],[3]		$ 75
Borrowed			0				75	[1],[2],[3]
Letters of credit and commercial paper issued			0				$ 0
Unused capacity	[1],[2],[3]		$ 75
Interest rate on outstanding borrowing							1.68%		1.68%
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 25
LGE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Dec. 31, 2020
Capacity	[1],[2]		$ 500
Borrowed			0				$ 0
Letters of credit and commercial paper issued	[1],[2]		169				142
Unused capacity	[1],[2]		$ 331
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 100
LGE [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
KU [Member]
Financing Activities [Line Items]
Capacity			598
Borrowed			0				0
Letters of credit and commercial paper issued			214				246
Unused capacity			$ 384
KU [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Dec. 31, 2020
Capacity	[1],[2]		$ 400
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2]		16				48
Unused capacity	[1],[2]		$ 384
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 100
KU [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
KU [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Oct. 01, 2017
Capacity	[1],[2],[4]		$ 198
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2],[4]		198				198
Unused capacity			$ 0
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
U.K. [Member]
Financing Activities [Line Items]
Capacity | £				£ 1,145
Borrowed | £	[5]			339					£ 133
Letters of credit and commercial paper issued | £				4					4
Unused capacity			$ 1,000	801	[5]
U.K. [Member] | Uncommitted Credit Facilities [Member]
Financing Activities [Line Items]
Capacity | £				90
Borrowed			$ 75	60					0
Letters of credit and commercial paper issued | £				4					4
Unused capacity | £				£ 26
Interest rate on outstanding borrowing			1.26%	1.26%
U.K. [Member] | WPD PLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Jan. 13, 2021
Capacity | £	[1],[6]			£ 210
Borrowed			$ 200	160	[1],[6]	£ 161	$ 200		133	[1],[6]
Letters of credit and commercial paper issued | £				0					£ 0
Unused capacity | £	[1],[6]			£ 49
Minimum interest coverage ratio allowed under the credit facility			3.0 times
Maximum percentage of total net debt to RAV allowed under the credit facility			85.00%	85.00%
Interest rate on outstanding borrowing			1.43%	1.43%			1.83%		1.83%
U.K. [Member] | WPD South West [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Jul. 29, 2021
Capacity | £	[1],[6]			£ 245
Borrowed			$ 137	110	[1],[6]				£ 0
Letters of credit and commercial paper issued | £				0					0
Unused capacity | £	[1],[6]			£ 135
Minimum interest coverage ratio allowed under the credit facility			3.0 times
Maximum percentage of total net debt to RAV allowed under the credit facility			85.00%	85.00%
Interest rate on outstanding borrowing			0.66%	0.66%
U.K. [Member] | WPD East Midlands [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Jul. 29, 2021
Capacity | £	[1],[6]			£ 300
Borrowed			$ 11	9	[1],[6]				0
Letters of credit and commercial paper issued | £				0					0
Unused capacity | £	[1],[6]			£ 291
Minimum interest coverage ratio allowed under the credit facility			3.0 times
Maximum percentage of total net debt to RAV allowed under the credit facility			85.00%	85.00%
Interest rate on outstanding borrowing			0.66%	0.66%
U.K. [Member] | WPD West Midlands [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Jul. 29, 2021
Capacity | £	[1],[6]			£ 300
Borrowed | £				0					0
Letters of credit and commercial paper issued | £				0					£ 0
Unused capacity | £	[1],[6]			£ 300
Minimum interest coverage ratio allowed under the credit facility			3.0 times
Maximum percentage of total net debt to RAV allowed under the credit facility			85.00%	85.00%
U.S. [Member] | PPL Capital Funding [Member]
Financing Activities [Line Items]
Capacity			$ 1,400
Borrowed			0				$ 0
Letters of credit and commercial paper issued			37				471
Unused capacity			$ 1,363
U.S. [Member] | PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Jan. 29, 2021
Capacity	[1],[2]		$ 950
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2]		20				151
Unused capacity	[1],[2]		$ 930
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
U.S. [Member] | PPL Capital Funding [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
U.S. [Member] | PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Nov. 12, 2018
Capacity	[1],[2]		$ 300
Borrowed			0				0
Letters of credit and commercial paper issued			0				300	[1],[2]
Unused capacity	[1],[2]		$ 300
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 30
U.S. [Member] | PPL Capital Funding [Member] | Bilateral Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Mar. 17, 2017
Capacity	[1],[2]		$ 150
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2]		17				20
Unused capacity	[1],[2]		$ 133
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 30
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Jan. 29, 2021
Capacity	[1],[2]		$ 650
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2]		296				1
Unused capacity	[1],[2]		$ 354
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
LG And E And KU Energy LLC [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Oct. 30, 2018
Capacity	[1],[2],[3]		$ 75
Borrowed			0				75	[1],[2],[3]
Letters of credit and commercial paper issued			0				$ 0
Unused capacity	[1],[2],[3]		$ 75
Interest rate on outstanding borrowing							1.68%		1.68%
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 25
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Dec. 31, 2020
Capacity	[1],[2]		$ 500
Borrowed			0				$ 0
Letters of credit and commercial paper issued	[1],[2]		169				142
Unused capacity	[1],[2]		$ 331
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 100
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
LG And E And KU Energy LLC [Member] | KU [Member]
Financing Activities [Line Items]
Capacity			598
Borrowed			0				0
Letters of credit and commercial paper issued			214				246
Unused capacity			$ 384
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Dec. 31, 2020
Capacity	[1],[2]		$ 400
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2]		16				48
Unused capacity	[1],[2]		$ 384
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 100
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
LG And E And KU Energy LLC [Member] | KU [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Oct. 01, 2017
Capacity	[1],[2],[4]		$ 198
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2],[4]		198				198
Unused capacity			$ 0
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Dec. 31, 2020
Capacity	[1],[2]		$ 500
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2]		169				142
Unused capacity	[1],[2]		$ 331
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 100
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
Kentucky Utilities Co [Member]
Financing Activities [Line Items]
Capacity			598
Borrowed			0				0
Letters of credit and commercial paper issued			214				246
Unused capacity			$ 384
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Dec. 31, 2020
Capacity	[1],[2]		$ 400
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2]		16				48
Unused capacity	[1],[2]		$ 384
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%
Potential capacity increase			$ 100
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member] | Subsequent Event [Member]
Financing Activities [Line Items]
Expiration date		Jan. 27, 2022
Kentucky Utilities Co [Member] | Letter Of Credit Facility [Member]
Financing Activities [Line Items]
Expiration date			Oct. 01, 2017
Capacity	[1],[2],[4]		$ 198
Borrowed			0				0
Letters of credit and commercial paper issued	[1],[2],[4]		198				$ 198
Unused capacity			$ 0
Maximum percentage of debt to total capitalization allowed under the credit facility			70.00%	70.00%

[1] Each company pays customary fees under its respective facility and borrowings generally bear interest at LIBOR-based rates plus an applicable margin.

[2] The facilities contain a financial covenant requiring debt to total capitalization not to exceed 70% for PPL Capital Funding, PPL Electric, LKE, LG&E and KU, as calculated in accordance with the facilities and other customary covenants. Additionally, as it relates to the syndicated and bilateral credit facilities and subject to certain conditions, PPL Capital Funding may request that the capacity of its facilities expiring in November 2018 and March 2017 be increased by up to $30 million, LG&E and KU each may request up to a $100 million increase in its facility's capacity and LKE may request up to a $25 million increase in its facility's capacity.

[3] At December 31, 2015, LKE's interest rate on outstanding borrowings was 1.68%.

[4] KU's letter of credit facility agreement allows for certain payments under the letter of credit facility to be converted to loans rather than requiring immediate payment.

[5] The WPD plc amounts borrowed at December 31, 2016 and 2015 included USD-denominated borrowings of $200 million for both periods, which bore interest at 1.43% and 1.83%. The unused capacity reflects the amount borrowed in GBP of £161 million as of the date borrowed. The WPD (South West) amount borrowed at December 31, 2016 was a GBP-denominated borrowing, which equated to $137 million and bore interest at 0.66%. The WPD (East Midlands) amount borrowed at December 31, 2016 was a GBP-denominated borrowing, which equated to $11 million and bore interest at 0.66%. The WPD Uncommitted Credit Facilities amounts borrowed at December 31, 2016 were GBP-denominated borrowings which equated to $75 million and bore interest at 1.26%. At December 31, 2016, the unused capacity under the U.K. credit facilities was approximately $1 billion.

[6] The facilities contain financial covenants to maintain an interest coverage ratio of not less than 3.0 times consolidated earnings before income taxes, depreciation and amortization and total net debt not in excess of 85% of its RAV, calculated in accordance with the credit facility.