Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Valuation Allowances and Reserves (Details) [Roll Forward]
Additions charged to other accounts
Reduction of the valuation allowance as a result of the reduction in the UK statutory income tax rate	67,000,000		46,000,000
Permanently reinvested cumulative undistributed foreign earnings	2,900,000,000		2,000,000,000
Valuation Allowance Of Deferred Tax Assets [Member]
Valuation Allowances and Reserves (Details) [Roll Forward]
Balance at beginning of period	706,000,000		724,000,000		464,000,000
Additions charged to income	29,000,000		18,000,000		190,000,000
Additions charged to other accounts			10,000,000		112,000,000	[1]
Deductions	72,000,000	[2]	46,000,000	[2]	42,000,000	[2]
Balance at end of period	663,000,000		706,000,000		724,000,000
Valuation allowance recorded against certain deferred tax assets as a result of the WPD Midlands acquisition					101,000,000
Reduction of the valuation allowance as a result of the reduction in the UK statutory income tax rate					35,000,000
Investment Tax Credit [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	245,000,000
Investment Tax Credit [Member] | Federal [Member] | Minimum [Member]
Credit carryforwards
Expiration	2025-12-31
Investment Tax Credit [Member] | Federal [Member] | Maximum [Member]
Credit carryforwards
Expiration	2033-12-31
Alternative Minimum Tax Credit [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	32,000,000
Foreign Tax Credit [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	17,000,000
Foreign Tax Credit [Member] | Federal [Member] | Minimum [Member]
Credit carryforwards
Expiration	2017-12-31
Foreign Tax Credit [Member] | Federal [Member] | Maximum [Member]
Credit carryforwards
Expiration	2023-12-31
Other [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	35,000,000
Other [Member] | Federal [Member] | Minimum [Member]
Credit carryforwards
Expiration	2016-12-31
Other [Member] | Federal [Member] | Maximum [Member]
Credit carryforwards
Expiration	2033-12-31
Other [Member] | State [Member]
Credit carryforwards
Credit carryforwards, amount	5,000,000
Expiration	2022-12-31
PPL Energy Supply LLC [Member] | Valuation Allowance Of Deferred Tax Assets [Member]
Valuation Allowances and Reserves (Details) [Roll Forward]
Balance at beginning of period	74,000,000		72,000,000		408,000,000
Additions charged to income	4,000,000		2,000,000		22,000,000
Additions charged to other accounts
Deductions					358,000,000	[3]
Balance at end of period	78,000,000		74,000,000		72,000,000
PPL Energy Supply LLC [Member] | Investment Tax Credit [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	120,000,000
PPL Energy Supply LLC [Member] | Investment Tax Credit [Member] | Federal [Member] | Minimum [Member]
Credit carryforwards
Expiration	2031-12-31
PPL Energy Supply LLC [Member] | Investment Tax Credit [Member] | Federal [Member] | Maximum [Member]
Credit carryforwards
Expiration	2033-12-31
PPL Energy Supply LLC [Member] | Other [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	9,000,000
PPL Energy Supply LLC [Member] | Other [Member] | Federal [Member] | Minimum [Member]
Credit carryforwards
Expiration	2031-12-31
PPL Energy Supply LLC [Member] | Other [Member] | Federal [Member] | Maximum [Member]
Credit carryforwards
Expiration	2033-12-31
LG And E And KU Energy LLC [Member] | Valuation Allowance Of Deferred Tax Assets [Member]
Valuation Allowances and Reserves (Details) [Roll Forward]
Balance at beginning of period	5,000,000		5,000,000		6,000,000
Additions charged to other accounts
Deductions	1,000,000	[4]			1,000,000	[4]
Balance at end of period	4,000,000		5,000,000		5,000,000
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	125,000,000
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member] | Minimum [Member]
Credit carryforwards
Expiration	2025-12-31
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member] | Maximum [Member]
Credit carryforwards
Expiration	2028-12-31
LG And E And KU Energy LLC [Member] | Alternative Minimum Tax Credit [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	28,000,000
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member]
Credit carryforwards
Credit carryforwards, amount	26,000,000
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member] | Minimum [Member]
Credit carryforwards
Expiration	2016-12-31
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member] | Maximum [Member]
Credit carryforwards
Expiration	2033-12-31
LG And E And KU Energy LLC [Member] | Other [Member] | State [Member]
Credit carryforwards
Credit carryforwards, amount	$ 9,000,000
Expiration	2022-12-31

[1] Primarily related to a $101 million valuation allowance that was recorded against certain deferred tax assets as a result of the 2011 acquisition of WPD Midlands. See Note 10 for additional information on the acquisition.

[2] The reductions of the U.K. statutory income tax rate in 2013, 2012 and 2011 resulted in $67 million, $46 million and $35 million in reductions in deferred tax assets and the corresponding valuation allowances. See "Reconciliation of Income Tax Expense" below for more information on the impact of the U.K. Finance Acts of 2013, 2012 and 2011.

[3] During 2011, PPL Energy Supply distributed its membership interest in PPL Global to PPL Energy Funding. See Note 9 for additional information.

[4] Primarily related to the expiration of state capital loss carryforwards.