Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Integer		Dec. 31, 2012		Dec. 31, 2011 Integer		Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items]
Period of lag in reporting results for WPD Midlands (in months)	1
Months of operating results included in PPL's results for WPD Midlands for a specific period					8
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total Accumulated Other Comprehensive Loss, Net of Tax	$ (1,565,000,000)		$ (1,940,000,000)		$ (788,000,000)		$ (479,000,000)
Utility Revenue (Details) [Abstract]
Domestic electric and gas revenue	4,842,000,000	[1]	4,519,000,000	[1]	4,674,000,000	[1]
U.K. electric revenue	2,359,000,000	[2]	2,289,000,000	[2]	1,618,000,000	[2]
Total	7,201,000,000		6,808,000,000		6,292,000,000
Revenue Recognition (Numeric) [Abstract]
Costs in excess of billings on uncompleted contracts or programs	14,000,000		12,000,000
Billings in excess of cost	75,000,000		70,000,000
Allowance for Doubtful Accounts (Details) [Roll Forward]
Additions charged to other accounts
Cash (Numeric) [Abstract]
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months)	3
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	156,000,000		135,000,000
Equity Method Investment [Abstract]
Income (loss) from investment			(8,000,000)		1,000,000
Property, Plant and Equipment (Numeric) [Abstract]
Interest costs, capitalized during the period	46,000,000		53,000,000		51,000,000
Depreciation (Details) [Abstract]
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates	22,000,000
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value	20.00%
The expected average remaining service of active plan participants	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis	30.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized	50.00%
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	702,000,000		673,000,000
Fuel [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	305,000,000		284,000,000
Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	49,000,000	[3]	50,000,000	[3]
Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	348,000,000		339,000,000
Regulated Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates	2.94%		3.12%
Nonregulated Property Plant And Equipment Generation [Member]
Depreciation (Details) [Abstract]
Weighted-average rates	3.10%		3.05%
Nonregulated Property Plant And Equipment Generation [Member] | Brunner Island And Montour Plants [Member]
Asset Impairment (Excluding Investments) (Numeric) [Abstract]
Carrying value of utility plants	2,700,000,000
Nonregulated Property Plant And Equipment Generation [Member] | Brunner Island Plant [Member]
Asset Impairment (Excluding Investments) (Numeric) [Abstract]
Carrying value of utility plants	1,400,000,000
Nonregulated Property Plant And Equipment Generation [Member] | Montour Plant [Member]
Asset Impairment (Excluding Investments) (Numeric) [Abstract]
Carrying value of utility plants	1,300,000,000
Margin Deposits Posted To Counterparties [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	67,000,000		43,000,000
Cash Collateral Posted To Counterparties [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	22,000,000		32,000,000
Low Carbon Network Fund [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	27,000,000	[4]	14,000,000	[4]
Funds Deposited With Trustee [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	12,000,000	[5]	13,000,000	[5]
Ironwood Debt Service Reserves [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	17,000,000		17,000,000
Other Restricted Cash [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	11,000,000		16,000,000
Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period	64,000,000		54,000,000		55,000,000
Additions charged to income	39,000,000		55,000,000	[6]	65,000,000	[6]
Additions charged to other accounts	4,000,000
Deductions	43,000,000	[7]	45,000,000	[7]	66,000,000	[7],[8]
Balance at end of period	64,000,000		64,000,000		54,000,000
Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	985,000,000		848,000,000		875,000,000
KU [Member] | Electric Energy Inc [Member]
Equity Method Investment [Abstract]
Ownership percentage	20.00%
Income (loss) from investment			8,000,000
Impairment charge			25,000,000
Impairment charge, after-tax			15,000,000
PPL Energy Supply LLC [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total Accumulated Other Comprehensive Loss, Net of Tax	77,000,000		48,000,000		487,000,000		(355,000,000)
Revenue Recognition (Numeric) [Abstract]
Costs in excess of billings on uncompleted contracts or programs	14,000,000		12,000,000
Billings in excess of cost	75,000,000		70,000,000
Cash (Numeric) [Abstract]
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months)	3
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	85,000,000		63,000,000
Property, Plant and Equipment (Numeric) [Abstract]
Interest costs, capitalized during the period	37,000,000		47,000,000		47,000,000
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value	20.00%
The expected average remaining service of active plan participants	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis	30.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized	50.00%
Intercompany tax receivables (payables)	44,000,000		(38,000,000)
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	358,000,000		327,000,000
PPL Energy Supply LLC [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	163,000,000		135,000,000
PPL Energy Supply LLC [Member] | Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	2,000,000	[3]	8,000,000	[3]
PPL Energy Supply LLC [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	193,000,000		184,000,000
PPL Energy Supply LLC [Member] | Nonregulated Property Plant And Equipment Generation [Member]
Depreciation (Details) [Abstract]
Weighted-average rates	3.10%		3.05%
PPL Energy Supply LLC [Member] | Nonregulated Property Plant And Equipment Generation [Member] | Brunner Island And Montour Plants [Member]
Asset Impairment (Excluding Investments) (Numeric) [Abstract]
Carrying value of utility plants	2,700,000,000
PPL Energy Supply LLC [Member] | Nonregulated Property Plant And Equipment Generation [Member] | Brunner Island Plant [Member]
Asset Impairment (Excluding Investments) (Numeric) [Abstract]
Carrying value of utility plants	1,400,000,000
PPL Energy Supply LLC [Member] | Nonregulated Property Plant And Equipment Generation [Member] | Montour Plant [Member]
Asset Impairment (Excluding Investments) (Numeric) [Abstract]
Carrying value of utility plants	1,300,000,000
PPL Energy Supply LLC [Member] | Margin Deposits Posted To Counterparties [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	67,000,000		43,000,000
PPL Energy Supply LLC [Member] | Ironwood Debt Service Reserves [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	17,000,000		17,000,000
PPL Energy Supply LLC [Member] | Other Restricted Cash [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	1,000,000		3,000,000
PPL Energy Supply LLC [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period	23,000,000		15,000,000		20,000,000
Additions charged to income	1,000,000		12,000,000	[6]	14,000,000	[6]
Additions charged to other accounts
Deductions	3,000,000	[7]	4,000,000	[7]	19,000,000	[7],[8]
Balance at end of period	21,000,000		23,000,000		15,000,000
PPL Electric Utilities Corp [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	12,000,000		13,000,000
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value	20.00%
The expected average remaining service of active plan participants	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis	30.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized	50.00%
Intercompany tax receivables (payables)	(19,000,000)		22,000,000
PPL Electric Utilities Corp [Member] | Regulated Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates	2.61%		2.57%
PPL Electric Utilities Corp [Member] | Funds Deposited With Trustee [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	12,000,000	[5]	13,000,000	[5]
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period	18,000,000		17,000,000		17,000,000
Additions charged to income	32,000,000		32,000,000		33,000,000
Additions charged to other accounts
Deductions	32,000,000	[7]	31,000,000	[7]	33,000,000	[7]
Balance at end of period	18,000,000		18,000,000		17,000,000
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	985,000,000		848,000,000		875,000,000
PPL Electric Utilities Corp [Member] | Affiliated Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	294,000,000		313,000,000		264,000,000
LG And E And KU Energy LLC [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total Accumulated Other Comprehensive Loss, Net of Tax	13,000,000		(15,000,000)		4,000,000		6,000,000
Cash (Numeric) [Abstract]
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months)	3
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	22,000,000		32,000,000
Depreciation (Details) [Abstract]
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates	22,000,000
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value	20.00%
The expected average remaining service of active plan participants	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis	30.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized	50.00%
Intercompany tax receivables (payables)	(28,000,000)		(12,000,000)
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	278,000,000		276,000,000
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	10
Number of companies power is supplied to	11
LG And E And KU Energy LLC [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	141,000,000		149,000,000
LG And E And KU Energy LLC [Member] | Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	48,000,000	[3]	42,000,000	[3]
LG And E And KU Energy LLC [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	89,000,000		85,000,000
LG And E And KU Energy LLC [Member] | Regulated Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates	4.07%		4.39%
LG And E And KU Energy LLC [Member] | Cash Collateral Posted To Counterparties [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	22,000,000		32,000,000
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	19,000,000		17,000,000		17,000,000
Additions charged to income	4,000,000		9,000,000		15,000,000
Additions charged to other accounts	4,000,000	[9]
Deductions	5,000,000	[7]	7,000,000	[7]	15,000,000	[7]
Balance at end of period	22,000,000		19,000,000		17,000,000
LG And E And KU Energy LLC [Member] | LGE [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Ownership percentage	5.63%
Generation capacity in terms of ownership percentage (in MW)	120
LG And E And KU Energy LLC [Member] | KU [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Ownership percentage	2.50%
Generation capacity in terms of ownership percentage (in MW)	53
LG And E And KU Energy LLC [Member] | KU [Member] | Electric Energy Inc [Member]
Equity Method Investment [Abstract]
Ownership percentage	20.00%
Income (loss) from investment			8,000,000
Impairment charge			25,000,000
Impairment charge, after-tax			15,000,000
Louisville Gas And Electric Co [Member]
Utility Revenue (Details) [Abstract]
Total	1,351,000,000		1,247,000,000		1,281,000,000
Cash (Numeric) [Abstract]
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months)	3
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	22,000,000		32,000,000
Depreciation (Details) [Abstract]
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates	8,000,000
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value	20.00%
The expected average remaining service of active plan participants	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis	30.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized	50.00%
Intercompany tax receivables (payables)	(8,000,000)		5,000,000
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	154,000,000		142,000,000
Louisville Gas And Electric Co [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Number of electric utilities that are equity owners	10
Number of companies power is supplied to	11
Ownership percentage	5.63%
Generation capacity in terms of ownership percentage (in MW)	120
Louisville Gas And Electric Co [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	64,000,000		61,000,000
Louisville Gas And Electric Co [Member] | Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	48,000,000	[3]	42,000,000	[3]
Louisville Gas And Electric Co [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	42,000,000		39,000,000
Louisville Gas And Electric Co [Member] | Regulated Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates	4.52%		4.91%
Louisville Gas And Electric Co [Member] | Cash Collateral Posted To Counterparties [Member]
Restricted Cash and Cash Equivalents (Numeric) [Line Items]
Restricted cash and cash equivalents	22,000,000		32,000,000
Louisville Gas And Electric Co [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period	1,000,000		2,000,000		2,000,000
Additions charged to income	2,000,000		2,000,000		5,000,000
Additions charged to other accounts	1,000,000	[9]
Deductions	2,000,000	[7]	3,000,000	[7]	5,000,000	[7]
Balance at end of period	2,000,000		1,000,000		2,000,000
Kentucky Utilities Co [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total Accumulated Other Comprehensive Loss, Net of Tax	1,000,000		1,000,000
Utility Revenue (Details) [Abstract]
Total	1,625,000,000		1,512,000,000		1,512,000,000
Cash (Numeric) [Abstract]
Maximum maturity period for highly liquid debt instruments to be considered cash equivalents (in months)	3
Depreciation (Details) [Abstract]
Reduction in depreciation expense in 2013 as a result of lower weighted-average rates	14,000,000
Defined Benefits [Abstract]
Difference between the actual value of plan assets and the expected value	20.00%
The expected average remaining service of active plan participants	50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis	10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis	30.00%
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization	30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized	50.00%
Intercompany tax receivables (payables)	(27,000,000)		(15,000,000)
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	124,000,000		134,000,000
Kentucky Utilities Co [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Number of electric utilities that are equity owners	10
Number of companies power is supplied to	11
Ownership percentage	2.50%
Generation capacity in terms of ownership percentage (in MW)	53
Kentucky Utilities Co [Member] | Electric Energy Inc [Member]
Equity Method Investment [Abstract]
Ownership percentage	20.00%
Income (loss) from investment			8,000,000
Impairment charge			25,000,000
Impairment charge, after-tax			15,000,000
Kentucky Utilities Co [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	77,000,000		88,000,000
Kentucky Utilities Co [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Line Items]
Fuel, materials and supplies on the Balance Sheet	47,000,000		46,000,000
Kentucky Utilities Co [Member] | Regulated Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates	3.77%		4.06%
Kentucky Utilities Co [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period	2,000,000		2,000,000		6,000,000
Additions charged to income	3,000,000		4,000,000		6,000,000
Additions charged to other accounts	3,000,000	[9]
Deductions	4,000,000	[7]	4,000,000	[7]	10,000,000	[7]
Balance at end of period	$ 4,000,000		$ 2,000,000		$ 2,000,000

[1] Represents revenue from regulated generation, transmission and/or distribution in Pennsylvania, Kentucky, Virginia and Tennessee, including regulated wholesale revenue.

[2] Represents electric distribution revenue from the operation of WPD's distribution networks. 2011 includes eight months of revenue for WPD Midlands.

[3] The majority of LKE's and LG&E's natural gas stored underground is held to serve retail customers. The majority of PPL Energy Supply's natural gas stored underground is available for resale.

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

[5] Funds deposited with a trustee to defease PPL Electric's 1945 First Mortgage Bonds.

[6] Includes amounts related to the SMGT bankruptcy. See Note 15 for additional information.

[7] Primarily related to uncollectible accounts written off.

[8] Includes amounts related to the June 2011, FERC approved settlement agreement between PPL and the California ISO related to the sales made to the California ISO during the period October 2000 through June 2001 that were not paid to PPL subsidiaries. Therefore, the receivable and the related allowance for doubtful accounts were reversed and the settlement recorded.

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