Accumulated Other Comprehensive Income (Loss) (Income (Expense) Effect of Reclassifications) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Affected Line Item on the Statements of Income [Line Items]
Interest Expense																	$ (1,006)		$ (961)		$ (898)
Other Income (Expense) - net																	(23)		(39)		4
Total Pre-tax																	1,309		2,082		2,201
Income Taxes																	(180)		(545)		(691)
Total After-Tax	(98)	[1],[2]	410	[1]	404	[1]	413	[1]	360	[1]	355	[1]	277	[1]	545	[1]	1,129		1,537		1,510
Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total After-Tax																	(52)
Available For Sale Securities [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Unregulated wholesale energy
Energy purchases
Interest Expense
Other Income (Expense) - net																	10
Other
Total Pre-tax																	10
Income Taxes																	(4)
Total After-Tax																	6
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Unregulated wholesale energy																	263
Energy purchases																	(58)
Interest Expense																	(19)
Other Income (Expense) - net																	(28)
Other																	5
Total Pre-tax																	163
Income Taxes																	(80)
Total After-Tax																	83
Qualifying Derivatives [Member] | Interest Rate Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Unregulated wholesale energy
Energy purchases
Interest Expense																	(20)
Other Income (Expense) - net
Other
Total Pre-tax																	(20)
Income Taxes																	1
Total After-Tax																	(19)
Qualifying Derivatives [Member] | Cross Currency Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Energy purchases
Interest Expense																	1
Other Income (Expense) - net																	(28)
Other
Total Pre-tax																	(27)
Income Taxes																	4
Total After-Tax																	(23)
Qualifying Derivatives [Member] | Energy Commodities [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Unregulated wholesale energy																	263
Energy purchases																	(58)
Interest Expense
Other Income (Expense) - net
Other																	5
Total Pre-tax																	210
Income Taxes																	(85)
Total After-Tax																	125
Defined Benefit Plans [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax																	(194)
Income Taxes																	53
Total After-Tax																	(141)
Defined Benefit Plans [Member] | Prior Service Costs [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax																	(10)
Income Taxes																	4
Total After-Tax																	(6)
Defined Benefit Plans [Member] | Net Actuarial Loss [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax																	(184)
Income Taxes																	49
Total After-Tax																	(135)
PPL Energy Supply LLC [Member]
Affected Line Item on the Statements of Income [Line Items]
Interest Expense																	(171)		(168)		(174)
Other Income (Expense) - net																	30		18		23
Total Pre-tax																	(371)		738		1,212
Income Taxes																	142	[3]	(263)	[3]	(445)	[3]
Total After-Tax																	(229)		475		767
PPL Energy Supply LLC [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total After-Tax																	111
PPL Energy Supply LLC [Member] | Available For Sale Securities [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Unregulated wholesale energy
Energy purchases
Interest Expense
Other Income (Expense) - net																	10
Other
Total Pre-tax																	10
Income Taxes																	(4)
Total After-Tax																	6
PPL Energy Supply LLC [Member] | Qualifying Derivatives [Member] | Cross Currency Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Unregulated wholesale energy
PPL Energy Supply LLC [Member] | Qualifying Derivatives [Member] | Energy Commodities [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Unregulated wholesale energy																	263
Energy purchases																	(58)
Interest Expense
Other Income (Expense) - net
Other																	2
Total Pre-tax																	207
Income Taxes																	(84)
Total After-Tax																	123
PPL Energy Supply LLC [Member] | Defined Benefit Plans [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax																	(31)
Income Taxes																	13
Total After-Tax																	(18)
PPL Energy Supply LLC [Member] | Defined Benefit Plans [Member] | Prior Service Costs [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax																	(7)
Income Taxes																	3
Total After-Tax																	(4)
PPL Energy Supply LLC [Member] | Defined Benefit Plans [Member] | Net Actuarial Loss [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax																	(24)
Income Taxes																	10
Total After-Tax																	(14)
Kentucky Utilities Co [Member]
Affected Line Item on the Statements of Income [Line Items]
Energy purchases																	(22)		(32)		(29)
Interest Expense																	(70)		(69)		(70)
Other Income (Expense) - net																	(3)		(8)		(1)
Total Pre-tax																	360		215		282
Income Taxes																	$ (132)	[4]	$ (78)	[4]	$ (104)	[4]

[1] Quarterly results can vary depending on, among other things, weather and the forward pricing of power. Accordingly, comparisons among quarters of a year may not be indicative of overall trends and changes in operations.

[2] Fourth quarter of 2013 includes a charge for the termination of the lease of the Colstrip coal-fired electric generating facility in Montana. See Note 8 to the Financial Statements for additional information.

[3] Excludes current and deferred federal, state and foreign tax expense (benefit) recorded to Discontinued Operations of $3 million in 2011. Also, excludes federal, state and foreign tax expense (benefit) recorded to OCI of $47 million in 2013, $(267) million in 2012 and $(83) million in 2011. The deferred tax benefit of operating loss carryforwards was insignificant for 2011.

[4] Excludes deferred federal and state tax (benefit) recorded to OCI of less than $1 million in 2013 and $1 million in 2012.