Accumulated Other Comprehensive Income (Loss) (Income (Expense) Effect of Reclassifications) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Affected Line Item on the Statements of Income [Line Items]
Wholesale energy marketing	$ 980	$ 1,076	$ 2,767	$ 3,367
Energy purchases	(592)	(583)	(1,855)	(2,253)
Depreciation	(289)	(278)	(859)	(813)
Other Income (Expense) - net	(116)	(44)	19	(31)
Interest Expense	(246)	(248)	(755)	(714)
Total Pre-tax	494	372	1,571	1,541
Income Taxes	(84)	(17)	(344)	(364)
Total After-Tax	410	355	1,227	1,177
Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total After-Tax	(28)		19
Available For Sale Securities [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Wholesale energy marketing
Energy purchases
Depreciation
Other Income (Expense) - net	1		4
Interest Expense
Total Pre-tax	1		4
Income Taxes	(1)		(2)
Total After-Tax			2
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Wholesale energy marketing	58		198
Energy purchases	(11)		(41)
Depreciation	1		2
Other Income (Expense) - net	(25)		45
Interest Expense	(6)		(14)
Total Pre-tax	17		190
Income Taxes	(11)		(68)
Total After-Tax	6		122
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]
Wholesale energy marketing
Energy purchases
Depreciation
Other Income (Expense) - net
Interest Expense	(5)		(14)
Total Pre-tax	(5)		(14)
Income Taxes	2		6
Total After-Tax	(3)		(8)
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]
Wholesale energy marketing
Energy purchases
Depreciation
Other Income (Expense) - net	(25)		45
Interest Expense	(1)
Total Pre-tax	(26)		45
Income Taxes	7		(10)
Total After-Tax	(19)		35
Qualifying Derivatives [Member] | Energy Commodities [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Wholesale energy marketing	58		198
Energy purchases	(11)		(41)
Depreciation	1		2
Other Income (Expense) - net
Interest Expense
Total Pre-tax	48		159
Income Taxes	(20)		(64)
Total After-Tax	28		95
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	(48)		(146)
Income Taxes	13		40
Total After-Tax	(35)		(106)
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	(3)		(8)
Income Taxes	1		3
Total After-Tax	(2)		(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	(45)		(138)
Income Taxes	12		37
Total After-Tax	(33)		(101)
Equity Investees Accumulated Other Comprehensive Income [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Wholesale energy marketing
Energy purchases
Depreciation
Other Income (Expense) - net	1		1
Interest Expense
Total Pre-tax	1		1
Income Taxes
Total After-Tax	1		1
PPL Energy Supply LLC [Member]
Affected Line Item on the Statements of Income [Line Items]
Wholesale energy marketing	980	1,076	2,767	3,367
Energy purchases	(425)	(421)	(1,277)	(1,715)
Depreciation	(80)	(73)	(237)	(206)
Other Income (Expense) - net	2	5	18	16
Interest Expense	(39)	(43)	(131)	(123)
Total Pre-tax	199	71	279	585
Income Taxes	(74)	(16)	(106)	(202)
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	25		84
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]
Wholesale energy marketing
Energy purchases
Depreciation
Other Income (Expense) - net	1		4
Interest Expense
Total Pre-tax	1		4
Income Taxes	(1)		(2)
Total After-Tax			2
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]
Wholesale energy marketing	58		198
Energy purchases	(11)		(41)
Depreciation	1		2
Other Income (Expense) - net
Interest Expense
Total Pre-tax	48		159
Income Taxes	(19)		(63)
Total After-Tax	29		96
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	(7)		(23)
Income Taxes	3		9
Total After-Tax	(4)		(14)
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)		(5)
Income Taxes	1		2
Total After-Tax	(1)		(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	(5)		(18)
Income Taxes	2		7
Total After-Tax	$ (3)		$ (11)