Fair Value Measurements and Credit Concentration (Assets and Liabilities Measured on Recurring Basis Table) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Price risk management liabilities:
Total price risk management liabilities	$ 1,244		$ 1,694
Recurring [Member]
Assets
Cash and cash equivalents	1,102		901
Restricted cash and cash equivalents	156	[1]	135	[1]
Price risk management assets:
Energy commodities assets	1,188		2,068
Interest rate swaps assets	91		15
Cross-currency swaps assets			14
Total price risk management assets	1,279		2,097
NDT funds	864		712
Auction rate securities	19	[2]	19	[2]
Total assets	3,420		3,864
Price risk management liabilities:
Energy commodities liabilities	1,070		1,566
Interest rate swaps liabilities	36		80
Foreign currency contracts liabilities	106		44
Cross-currency swaps liabilities	32		4
Total price risk management liabilities	1,244		1,694
Recurring [Member] | Cash And Cash Equivalents [Member]
Price risk management assets:
NDT funds	14		11
Recurring [Member] | United States Large Cap Equity Securities [Member]
Price risk management assets:
NDT funds	547		412
Recurring [Member] | United States Mid Small Cap Equity Securities [Member]
Price risk management assets:
NDT funds	81		60
Recurring [Member] | US Treasury Debt Securities [Member]
Price risk management assets:
NDT funds	95		95
Recurring [Member] | US Government Sponsored Agency Debt Securities [Member]
Price risk management assets:
NDT funds	6		9
Recurring [Member] | Municipality Debt Securities [Member]
Price risk management assets:
NDT funds	77		82
Recurring [Member] | Investment Grade Corporate Debt Securities [Member]
Price risk management assets:
NDT funds	38		40
Recurring [Member] | Other Debt Securities [Member]
Price risk management assets:
NDT funds	5		3
Recurring [Member] | Receivables Payables Net [Member]
Price risk management assets:
NDT funds	1
Recurring [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	1,102		901
Restricted cash and cash equivalents	156	[1]	135	[1]
Price risk management assets:
Energy commodities assets	3		2
Interest rate swaps assets
Cross-currency swaps assets
Total price risk management assets	3		2
NDT funds	550		437
Auction rate securities
Total assets	1,811		1,475
Price risk management liabilities:
Energy commodities liabilities	4		2
Interest rate swaps liabilities
Foreign currency contracts liabilities
Cross-currency swaps liabilities
Total price risk management liabilities	4		2
Recurring [Member] | Level 1 [Member] | Cash And Cash Equivalents [Member]
Price risk management assets:
NDT funds	14		11
Recurring [Member] | Level 1 [Member] | United States Large Cap Equity Securities [Member]
Price risk management assets:
NDT funds	409		308
Recurring [Member] | Level 1 [Member] | United States Mid Small Cap Equity Securities [Member]
Price risk management assets:
NDT funds	33		25
Recurring [Member] | Level 1 [Member] | US Treasury Debt Securities [Member]
Price risk management assets:
NDT funds	95		95
Recurring [Member] | Level 1 [Member] | US Government Sponsored Agency Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 1 [Member] | Municipality Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 1 [Member] | Investment Grade Corporate Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 1 [Member] | Other Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 1 [Member] | Receivables Payables Net [Member]
Price risk management assets:
NDT funds	(1)		(2)
Recurring [Member] | Level 2 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Energy commodities assets	1,123		2,037
Interest rate swaps assets	91		15
Cross-currency swaps assets			13
Total price risk management assets	1,214		2,065
NDT funds	314		275
Auction rate securities			3
Total assets	1,528		2,343
Price risk management liabilities:
Energy commodities liabilities	1,028		1,557
Interest rate swaps liabilities	36		80
Foreign currency contracts liabilities	106		44
Cross-currency swaps liabilities	32		4
Total price risk management liabilities	1,202		1,685
Recurring [Member] | Level 2 [Member] | Cash And Cash Equivalents [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 2 [Member] | United States Large Cap Equity Securities [Member]
Price risk management assets:
NDT funds	138		104
Recurring [Member] | Level 2 [Member] | United States Mid Small Cap Equity Securities [Member]
Price risk management assets:
NDT funds	48		35
Recurring [Member] | Level 2 [Member] | US Treasury Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 2 [Member] | US Government Sponsored Agency Debt Securities [Member]
Price risk management assets:
NDT funds	6		9
Recurring [Member] | Level 2 [Member] | Municipality Debt Securities [Member]
Price risk management assets:
NDT funds	77		82
Recurring [Member] | Level 2 [Member] | Investment Grade Corporate Debt Securities [Member]
Price risk management assets:
NDT funds	38		40
Recurring [Member] | Level 2 [Member] | Other Debt Securities [Member]
Price risk management assets:
NDT funds	5		3
Recurring [Member] | Level 2 [Member] | Receivables Payables Net [Member]
Price risk management assets:
NDT funds	2		2
Recurring [Member] | Level 3 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Energy commodities assets	62		29
Interest rate swaps assets
Cross-currency swaps assets			1
Total price risk management assets	62		30
NDT funds
Auction rate securities	19	[2]	16	[2]
Total assets	81		46
Price risk management liabilities:
Energy commodities liabilities	38		7
Interest rate swaps liabilities
Foreign currency contracts liabilities
Cross-currency swaps liabilities
Total price risk management liabilities	38		7
Recurring [Member] | Level 3 [Member] | Cash And Cash Equivalents [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 3 [Member] | United States Large Cap Equity Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 3 [Member] | United States Mid Small Cap Equity Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 3 [Member] | US Treasury Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 3 [Member] | US Government Sponsored Agency Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 3 [Member] | Municipality Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 3 [Member] | Investment Grade Corporate Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 3 [Member] | Other Debt Securities [Member]
Price risk management assets:
NDT funds
Recurring [Member] | Level 3 [Member] | Receivables Payables Net [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member]
Assets
Cash and cash equivalents	239		413
Restricted cash and cash equivalents	85	[1]	63	[1]
Price risk management assets:
Energy commodities assets	1,188		2,068
Total price risk management assets	1,188		2,068
NDT funds	864		712
Auction rate securities	16	[2]	16	[2]
Total assets	2,392		3,272
Price risk management liabilities:
Energy commodities liabilities	1,070		1,566
Total price risk management liabilities	1,070		1,566
PPL Energy Supply LLC [Member] | Recurring [Member] | Cash And Cash Equivalents [Member]
Price risk management assets:
NDT funds	14		11
PPL Energy Supply LLC [Member] | Recurring [Member] | United States Large Cap Equity Securities [Member]
Price risk management assets:
NDT funds	547		412
PPL Energy Supply LLC [Member] | Recurring [Member] | United States Mid Small Cap Equity Securities [Member]
Price risk management assets:
NDT funds	81		60
PPL Energy Supply LLC [Member] | Recurring [Member] | US Treasury Debt Securities [Member]
Price risk management assets:
NDT funds	95		95
PPL Energy Supply LLC [Member] | Recurring [Member] | US Government Sponsored Agency Debt Securities [Member]
Price risk management assets:
NDT funds	6		9
PPL Energy Supply LLC [Member] | Recurring [Member] | Municipality Debt Securities [Member]
Price risk management assets:
NDT funds	77		82
PPL Energy Supply LLC [Member] | Recurring [Member] | Investment Grade Corporate Debt Securities [Member]
Price risk management assets:
NDT funds	38		40
PPL Energy Supply LLC [Member] | Recurring [Member] | Other Debt Securities [Member]
Price risk management assets:
NDT funds	5		3
PPL Energy Supply LLC [Member] | Recurring [Member] | Receivables Payables Net [Member]
Price risk management assets:
NDT funds	1
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	239		413
Restricted cash and cash equivalents	85	[1]	63	[1]
Price risk management assets:
Energy commodities assets	3		2
Total price risk management assets	3		2
NDT funds	550		437
Auction rate securities
Total assets	877		915
Price risk management liabilities:
Energy commodities liabilities	4		2
Total price risk management liabilities	4		2
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | Cash And Cash Equivalents [Member]
Price risk management assets:
NDT funds	14		11
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | United States Large Cap Equity Securities [Member]
Price risk management assets:
NDT funds	409		308
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | United States Mid Small Cap Equity Securities [Member]
Price risk management assets:
NDT funds	33		25
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | US Treasury Debt Securities [Member]
Price risk management assets:
NDT funds	95		95
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | US Government Sponsored Agency Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | Municipality Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | Investment Grade Corporate Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | Other Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 1 [Member] | Receivables Payables Net [Member]
Price risk management assets:
NDT funds	(1)		(2)
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Energy commodities assets	1,123		2,037
Total price risk management assets	1,123		2,037
NDT funds	314		275
Auction rate securities			3
Total assets	1,437		2,315
Price risk management liabilities:
Energy commodities liabilities	1,028		1,557
Total price risk management liabilities	1,028		1,557
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | Cash And Cash Equivalents [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | United States Large Cap Equity Securities [Member]
Price risk management assets:
NDT funds	138		104
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | United States Mid Small Cap Equity Securities [Member]
Price risk management assets:
NDT funds	48		35
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | US Treasury Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | US Government Sponsored Agency Debt Securities [Member]
Price risk management assets:
NDT funds	6		9
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | Municipality Debt Securities [Member]
Price risk management assets:
NDT funds	77		82
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | Investment Grade Corporate Debt Securities [Member]
Price risk management assets:
NDT funds	38		40
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | Other Debt Securities [Member]
Price risk management assets:
NDT funds	5		3
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 2 [Member] | Receivables Payables Net [Member]
Price risk management assets:
NDT funds	2		2
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Energy commodities assets	62		29
Total price risk management assets	62		29
NDT funds
Auction rate securities	16	[2]	13	[2]
Total assets	78		42
Price risk management liabilities:
Energy commodities liabilities	38		7
Total price risk management liabilities	38		7
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | Cash And Cash Equivalents [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | United States Large Cap Equity Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | United States Mid Small Cap Equity Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | US Treasury Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | US Government Sponsored Agency Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | Municipality Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | Investment Grade Corporate Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | Other Debt Securities [Member]
Price risk management assets:
NDT funds
PPL Energy Supply LLC [Member] | Recurring [Member] | Level 3 [Member] | Receivables Payables Net [Member]
Price risk management assets:
NDT funds
PPL Electric Utilities Corp [Member] | Recurring [Member]
Assets
Cash and cash equivalents	25		140
Restricted cash and cash equivalents	12	[3]	13	[3]
Price risk management assets:
Total assets	37		153
PPL Electric Utilities Corp [Member] | Recurring [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	25		140
Restricted cash and cash equivalents	12	[3]	13	[3]
Price risk management assets:
Total assets	37		153
PPL Electric Utilities Corp [Member] | Recurring [Member] | Level 2 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Total assets
PPL Electric Utilities Corp [Member] | Recurring [Member] | Level 3 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Total assets
LG And E And KU Energy LLC [Member] | Recurring [Member]
Assets
Cash and cash equivalents	35		43
Restricted cash and cash equivalents	22	[4]	32	[4]
Price risk management assets:
Interest rate swaps assets			14
Total price risk management assets			14
Total assets	57		89
Price risk management liabilities:
Interest rate swaps liabilities	36		58
Total price risk management liabilities	36		58
LG And E And KU Energy LLC [Member] | Recurring [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	35		43
Restricted cash and cash equivalents	22	[4]	32	[4]
Price risk management assets:
Interest rate swaps assets
Total price risk management assets
Total assets	57		75
Price risk management liabilities:
Interest rate swaps liabilities
Total price risk management liabilities
LG And E And KU Energy LLC [Member] | Recurring [Member] | Level 2 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Interest rate swaps assets			14
Total price risk management assets			14
Total assets			14
Price risk management liabilities:
Interest rate swaps liabilities	36		58
Total price risk management liabilities	36		58
LG And E And KU Energy LLC [Member] | Recurring [Member] | Level 3 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Interest rate swaps assets
Total price risk management assets
Total assets
Price risk management liabilities:
Interest rate swaps liabilities
Total price risk management liabilities
Louisville Gas And Electric Co [Member] | Recurring [Member]
Assets
Cash and cash equivalents	8		22
Restricted cash and cash equivalents	22	[4]	32	[4]
Price risk management assets:
Interest rate swaps assets			7
Total price risk management assets			7
Total assets	30		61
Price risk management liabilities:
Interest rate swaps liabilities	36		58
Total price risk management liabilities	36		58
Louisville Gas And Electric Co [Member] | Recurring [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	8		22
Restricted cash and cash equivalents	22	[4]	32	[4]
Price risk management assets:
Interest rate swaps assets
Total price risk management assets
Total assets	30		54
Price risk management liabilities:
Interest rate swaps liabilities
Total price risk management liabilities
Louisville Gas And Electric Co [Member] | Recurring [Member] | Level 2 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Interest rate swaps assets			7
Total price risk management assets			7
Total assets			7
Price risk management liabilities:
Interest rate swaps liabilities	36		58
Total price risk management liabilities	36		58
Louisville Gas And Electric Co [Member] | Recurring [Member] | Level 3 [Member]
Assets
Cash and cash equivalents
Restricted cash and cash equivalents
Price risk management assets:
Interest rate swaps assets
Total price risk management assets
Total assets
Price risk management liabilities:
Interest rate swaps liabilities
Total price risk management liabilities
Kentucky Utilities Co [Member] | Recurring [Member]
Assets
Cash and cash equivalents	21		21
Price risk management assets:
Interest rate swaps assets			7
Total price risk management assets			7
Total assets	21		28
Kentucky Utilities Co [Member] | Recurring [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	21		21
Price risk management assets:
Interest rate swaps assets
Total price risk management assets
Total assets	21		21
Kentucky Utilities Co [Member] | Recurring [Member] | Level 2 [Member]
Assets
Cash and cash equivalents
Price risk management assets:
Interest rate swaps assets			7
Total price risk management assets			7
Total assets			7
Kentucky Utilities Co [Member] | Recurring [Member] | Level 3 [Member]
Assets
Cash and cash equivalents
Price risk management assets:
Interest rate swaps assets
Total price risk management assets
Total assets

[1] Current portion is included in "Restricted cash and cash equivalents" and long-term portion is included in "Other noncurrent assets" on the Balance Sheets.

[2] Included in "Other investments" on the Balance Sheets.

[3] Current portion is included in "Other current assets" and the long-term portion is included in "Other noncurrent assets" on the Balance Sheets.

[4] Included in "Other noncurrent assets" on the Balance Sheets.