Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Millions		3 Months Ended																12 Months Ended
		Dec. 31, 2015 USD ($)		Sep. 30, 2015 USD ($)		Jun. 30, 2015 USD ($)		Mar. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)		Sep. 30, 2014 USD ($)		Jun. 30, 2014 USD ($)		Mar. 31, 2014 USD ($)		Dec. 31, 2015 GBP (£) Integer MW	Dec. 31, 2015 USD ($) Integer $ / shares MW	Dec. 31, 2014 USD ($)		Dec. 31, 2013 USD ($)
Utility Revenue (Details) [Abstract]
Domestic electric and gas revenue	[1]																		$ 5,239	$ 5,209		$ 4,842
U.K. electric revenue	[2]																		2,410	2,621		2,403
Domestic - other																			20	22		18
Operating Revenues		$ 1,780	[3]	$ 1,878	[3]	$ 1,781	[3]	$ 2,230	[3]	$ 1,946	[3]	$ 1,879	[3]	$ 1,849	[3]	$ 2,178	[3]		7,669	7,852		7,263
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		$ 33								31									33	31
Property, Plant and Equipment (Numeric) [Abstract]
Interest costs, capitalized during the period																			$ 11	16		15
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value		20.00%																	20.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%	30.00%
The expected average remaining service of active plan participants																		50.00%	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%	50.00%
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		$ 357								381									$ 357	381
New Accounting Pronouncement Early Adoption [Member]
Balance Sheet Classification of Deferred Taxes [Abstract]
Assets										125										125
Liabilities										0										0
Discontinued Operations - Assets										8										8
Discontinued Operations - Liabilities										4										4
Fuel [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		168								166									168	166
Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet	[4]	42								54									42	54
Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		147								161									$ 147	$ 161
Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		2.57%	2.57%	2.92%
Low Carbon Network Fund [Member]
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents	[5]	22								19									$ 22	$ 19
Other Restricted Cash [Member]
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		11								12									11	12
Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								44								43			44	43		41
Additions charged to income																			49	49		38
Additions charged to other accounts																			(2)	0		4	[6]
Deductions	[7]																		50	48		40
Balance at end of period		41								44									41	44		43
Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable																			$ 1,300	$ 1,100		985
WPD [Member]
Summary of Significant Accounting Policies [Line Items]
Period of lag in reporting results for WPD (in months) | Integer																		1	1
Revenue Recognition (Numeric) [Abstract]
Number of regulatory years later future demand revenue is affected																		2 years	2 years
Projected reduction to base demand revenue from a true up of forecasted RPI (projected TRU) for the 2015/16 regulatory year																			$ 45
Projected reduction to base demand revenue from a true up of forecasted RPI (projected TRU) in calendar year 2017																			30
Projected reduction to base demand revenue from a true up of forecasted RPI (projected TRU) in calendar year 2018																			$ 15
Percentage WPD's distribution network operators are able to retain of any under-spends																		70.00%	70.00%
Percentage WPD's distribution network operators bear of any over-spends																		70.00%	70.00%
Trailing average period used in the cost of debt calculation																		10 years	10 years
Projected reduction to revenue from a difference in prior periods between actual values and those in the agreed business plan (projected MOD adjustment) for the 2015/16 regulatory year																			$ 11
Projected reduction to revenue from a difference in prior periods between actual values and those in the agreed business plan (projected MOD adjustment) in calendar year 2017																			5
Projected reduction to revenue from a difference in prior periods between actual values and those in the agreed business plan (projected MOD adjustment) in calendar year 2018																			$ 6
Refunded/recovered period of lag for recovery of over and under-recovered amounts arising from 2014/15 onwards																		2 years	2 years
Previous refunded/recovered period of lag for recovery of over and under-recovered amounts																		1 year	1 year
Amount per residential network customer reduction given through reduced tariffs to be recovered | £																		£ 5
Amount of total recovery from residential network customer reduction given through reduced tariffs																			$ 56
WPD [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted average useful life																		69 years	69 years	55 years
Decrease in depreciation expense from change in weighted average useful lives																			$ 84
Decrease in depreciation expense from change in weighted average useful lives, after-tax																			$ 66
Decrease in depreciation expense from change in weighted average useful lives, per share | $ / shares																			$ 0.1
PPL Electric Utilities Corp [Member]
Utility Revenue (Details) [Abstract]
Operating Revenues		499	[8]	$ 519	[8]	$ 476	[8]	630	[8]	526	[8]	$ 477	[8]	$ 449	[8]	592	[8]		$ 2,124	$ 2,044		1,870
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		$ 2								3									$ 2	3
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value		20.00%																	20.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%	30.00%
The expected average remaining service of active plan participants																		50.00%	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%	50.00%
Intercompany tax receivables (payables)		$ 56								(25)									$ 56	(25)
PPL Electric Utilities Corp [Member] | New Accounting Pronouncement Early Adoption [Member]
Balance Sheet Classification of Deferred Taxes [Abstract]
Assets										58										58
Liabilities										0										$ 0
PPL Electric Utilities Corp [Member] | Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		2.46%	2.46%	2.46%
PPL Electric Utilities Corp [Member] | Other Restricted Cash [Member]
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		2								3									$ 2	$ 3
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								17								18			17	18		18
Additions charged to income																			39	34		32
Deductions	[7]																		40	35		32
Balance at end of period		$ 16								17									16	17		18
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable																			1,300	1,100		985
PPL Electric Utilities Corp [Member] | PPL EnergyPlus [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable																			146	336		294
LG And E And KU Energy LLC [Member]
Utility Revenue (Details) [Abstract]
Operating Revenues																			$ 3,115	3,168		2,976
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value		20.00%																	20.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%	30.00%
The expected average remaining service of active plan participants																		50.00%	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%	50.00%
Intercompany tax receivables (payables)		$ (10)								136									$ (10)	136
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		298								311									298	311
LG And E And KU Energy LLC [Member] | New Accounting Pronouncement Early Adoption [Member]
Balance Sheet Classification of Deferred Taxes [Abstract]
Assets										16										16
Liabilities										0										0
LG And E And KU Energy LLC [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		168								166									168	166
LG And E And KU Energy LLC [Member] | Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet	[4]	42								54									42	54
LG And E And KU Energy LLC [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		88								91									$ 88	$ 91
LG And E And KU Energy LLC [Member] | Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		3.69%	3.69%	3.80%
LG And E And KU Energy LLC [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Number of electric utilities that are equity owners | Integer																		10	10
Number of companies power is supplied to | Integer																		11	11
LG And E And KU Energy LLC [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								25								22			$ 25	$ 22		19
Additions charged to income																			9	14		4
Additions charged to other accounts																			(2)	0		4	[6]
Deductions	[7]																		9	11		5
Balance at end of period		$ 23								25									$ 23	25		22
LG And E And KU Energy LLC [Member] | LGE [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Ownership percentage																		5.63%	5.63%
Generation capacity in terms of ownership percentage (in MW) | MW																		120	120
LG And E And KU Energy LLC [Member] | KU [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Ownership percentage																		2.50%	2.50%
Generation capacity in terms of ownership percentage (in MW) | MW																		53	53
Louisville Gas And Electric Co [Member]
Utility Revenue (Details) [Abstract]
Operating Revenues																			$ 1,444	1,533		1,410
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value		20.00%																	20.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%	30.00%
The expected average remaining service of active plan participants																		50.00%	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%	50.00%
Intercompany tax receivables (payables)		$ 4								74									$ 4	74
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		151								162									151	162
Louisville Gas And Electric Co [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		71								66									71	66
Louisville Gas And Electric Co [Member] | Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet	[4]	42								54									42	54
Louisville Gas And Electric Co [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		38								42									$ 38	$ 42
Louisville Gas And Electric Co [Member] | Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		3.65%	3.65%	4.05%
Louisville Gas And Electric Co [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Number of electric utilities that are equity owners | Integer																		10	10
Number of companies power is supplied to | Integer																		11	11
Ownership percentage																		5.63%	5.63%
Generation capacity in terms of ownership percentage (in MW) | MW																		120	120
Louisville Gas And Electric Co [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								2								2			$ 2	$ 2		1
Additions charged to income																			2	5		2
Additions charged to other accounts																			0	(1)	[6]	1	[6]
Deductions	[7]																		3	4		2
Balance at end of period		$ 1								2									1	2		2
Kentucky Utilities Co [Member]
Utility Revenue (Details) [Abstract]
Operating Revenues																			$ 1,728	1,737		1,635
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value		20.00%																	20.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%	30.00%
The expected average remaining service of active plan participants																		50.00%	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%	50.00%
Intercompany tax receivables (payables)		$ (5)								60									$ (5)	60
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		147								149									147	149
Kentucky Utilities Co [Member] | New Accounting Pronouncement Early Adoption [Member]
Balance Sheet Classification of Deferred Taxes [Abstract]
Assets										2										2
Liabilities										0										0
Kentucky Utilities Co [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		97								100									97	100
Kentucky Utilities Co [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		50								49									$ 50	$ 49
Kentucky Utilities Co [Member] | Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		3.71%	3.71%	3.63%
Kentucky Utilities Co [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Number of electric utilities that are equity owners | Integer																		10	10
Number of companies power is supplied to | Integer																		11	11
Ownership percentage																		2.50%	2.50%
Generation capacity in terms of ownership percentage (in MW) | MW																		53	53
Kentucky Utilities Co [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								$ 2								$ 4			$ 2	$ 4		2
Additions charged to income																			5	8		3
Additions charged to other accounts																			0	(3)	[6]	3	[6]
Deductions	[7]																		5	7		4
Balance at end of period		$ 2								$ 2									$ 2	$ 2		$ 4

[1] Represents revenues from cost-based rate-regulated generation, transmission and/or distribution in Pennsylvania, Kentucky, Virginia and Tennessee, includ ing regulated wholesale revenue.

[2] Primarily represents regulated electricity distribution revenues from the operation of WPD's distribution networks.

[3] Quarterly results can vary depending on, among other things, weather . Accordingly, comparisons among quarters of a year may not be indicative of overall tr ends and changes in operations.

[4] The majority of LKE's and LG&E's natural gas stored underground is held to serve retail customers .

[5] Funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.

[6] Primarily related to capital projects, thus the provision was recorded as an adjustment to construction work in progress .

[7] Primarily related to uncollectible accounts written off.

[8] PPL Electric's business is seasonal in nature, with peak sales periods generally occurring in the winter and summer months. Accordingly, comparisons among quarters of a year may not be indicative of overall trends and changes in operations.