Accumulated Other Comprehensive Income (Loss) (Income (Expense) Effect of Reclassifications) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Affected Line Item on the Statements of Income [Line Items]
Depreciation	$ (305)	$ (284)
Other Income (Expense) - net	(23)	122
Interest Expense	(264)	(251)
Total Pre-tax	428	564
Income Taxes	(112)	(151)
Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total After-Tax	(46)	46
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
Other Income (Expense) - net	2	2
Other
Interest Expense
Total Pre-tax	2	2
Income Taxes	(1)	(1)
Total After-Tax	1	1
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Unregulated wholesale energy	1	67
Energy purchases	7	(16)
Other Income (Expense) - net	(29)	69
Other	1
Interest Expense	(3)	(5)
Total Pre-tax	(23)	115
Income Taxes	4	(35)
Total After-Tax	(19)	80
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
Other Income (Expense) - net
Other
Interest Expense	(3)	(5)
Total Pre-tax	(3)	(5)
Income Taxes	2	2
Total After-Tax	(1)	(3)
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
Energy purchases
Other Income (Expense) - net	(29)	69
Other
Interest Expense
Total Pre-tax	(29)	69
Income Taxes	6	(17)
Total After-Tax	(23)	52
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	1	67
Energy purchases	7	(16)
Other Income (Expense) - net
Other	1
Interest Expense
Total Pre-tax	9	51
Income Taxes	(4)	(20)
Total After-Tax	5	31
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	(38)	(49)
Income Taxes	10	14
Total After-Tax	(28)	(35)
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	(2)	(2)
Income Taxes	1	1
Total After-Tax	(1)	(1)
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	(36)	(47)
Income Taxes	9	13
Total After-Tax	(27)	(34)
PPL Energy Supply LLC [Member]
Affected Line Item on the Statements of Income [Line Items]
Depreciation	(80)	(78)
Other Income (Expense) - net	6	4
Interest Expense	(34)	(46)
Total Pre-tax	(115)	(73)
Income Taxes	49	35
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	4	26
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
Other Income (Expense) - net	2	2
Other
Interest Expense
Total Pre-tax	2	2
Income Taxes	(1)	(1)
Total After-Tax	1	1
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	1	67
Energy purchases	7	(16)
Other Income (Expense) - net
Other	1
Interest Expense
Total Pre-tax	9	51
Income Taxes	(4)	(21)
Total After-Tax	5	30
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	(4)	(8)
Income Taxes	2	3
Total After-Tax	(2)	(5)
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	(2)	(2)
Income Taxes	1	1
Total After-Tax	(1)	(1)
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	(2)	(6)
Income Taxes	1	2
Total After-Tax	$ (1)	$ (4)