Accumulated Other Comprehensive Income (Loss) (Income (Expense) Effect of Reclassifications) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Affected Line Item on the Statements of Income [Line Items]
Depreciation	$ (312)	$ (286)	$ (617)	$ (570)
Other Income (Expense) - net	(82)	13	(105)	135
Interest Expense	(258)	(258)	(522)	(509)
Total Pre-tax	378	513	806	1,077
Income Taxes	(149)	(109)	(261)	(260)
Total After-Tax	229	404	545	817
Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total After-Tax	(23)	1	(69)	47
Available For Sale Securities [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Other Income (Expense) - net	2	1	4	3
Total Pre-tax	2	1	4	3
Income Taxes	(1)		(2)	(1)
Total After-Tax	1	1	2	2
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax	10	58	(13)	173
Income Taxes	(5)	(22)	(1)	(57)
Total After-Tax	5	36	(14)	116
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]
Interest Expense	(4)	(4)	(7)	(9)
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]
Other Income (Expense) - net		1	(29)	70
Interest Expense	(1)	1	1	1
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	5	73	6	140
Energy purchases	8	(14)	15	(30)
Other		1	1	1
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)	(76)	(98)
Income Taxes	9	13	19	27
Total After-Tax	(29)	(36)	(57)	(71)
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)	(3)	(4)	(5)
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)	(46)	(72)	(93)
PPL Energy Supply LLC [Member]
Affected Line Item on the Statements of Income [Line Items]
Depreciation	(82)	(79)	(162)	(157)
Other Income (Expense) - net	8	12	14	16
Interest Expense	(35)	(46)	(69)	(92)
Total Pre-tax	10	153	(105)	80
Income Taxes	3	(67)	52	(32)
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	7	33	11	59
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]
Other Income (Expense) - net	2	1	4	3
Total Pre-tax	2	1	4	3
Income Taxes	(1)		(2)	(1)
Total After-Tax	1	1	2	2
PPL Energy Supply LLC [Member] | Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax	13	60	22	111
Income Taxes	(5)	(23)	(9)	(44)
Total After-Tax	8	37	13	67
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	5	73	6	140
Energy purchases	8	(14)	15	(30)
Other		1	1	1
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	(3)	(8)	(7)	(16)
Income Taxes	1	3	3	6
Total After-Tax	(2)	(5)	(4)	(10)
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		(1)	(2)	(3)
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	$ (3)	$ (7)	$ (5)	$ (13)