Fair Value Measurements and Credit Concentration (Net Asset and Liability Measured on Recurring Basis Level 3 Gain Loss Included in Earnings and Other Recurring Numeric Data) (Details) (Level 3 [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	$ (5)	$ 1
Energy Commodities, Net [Member] | Unregulated Wholesale Energy [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	(36)	(19)
Change in unrealized gains (losses) relating to positions still held at the reporting date	(23)	(3)
Energy Commodities, Net [Member] | Unregulated Retail Energy [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	25	26
Change in unrealized gains (losses) relating to positions still held at the reporting date	24	29
Energy Commodities, Net [Member] | Fuel [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	3
Change in unrealized gains (losses) relating to positions still held at the reporting date
Energy Commodities, Net [Member] | Energy Purchases [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	3	(5)
Change in unrealized gains (losses) relating to positions still held at the reporting date	1	1
Cross Currency Swaps [Member] | Interest Expense [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings		(1)
Change in unrealized gains (losses) relating to positions still held at the reporting date
PPL Energy Supply LLC [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	(5)	2
PPL Energy Supply LLC [Member] | Energy Commodities, Net [Member] | Unregulated Wholesale Energy [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	(36)	(19)
Change in unrealized gains (losses) relating to positions still held at the reporting date	(23)	(3)
PPL Energy Supply LLC [Member] | Energy Commodities, Net [Member] | Unregulated Retail Energy [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	25	26
Change in unrealized gains (losses) relating to positions still held at the reporting date	24	29
PPL Energy Supply LLC [Member] | Energy Commodities, Net [Member] | Fuel [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	3
Change in unrealized gains (losses) relating to positions still held at the reporting date
PPL Energy Supply LLC [Member] | Energy Commodities, Net [Member] | Energy Purchases [Member]
Net gains and losses on assets and liabilities [Abstract]
Total gains (losses) included in earnings	3	(5)
Change in unrealized gains (losses) relating to positions still held at the reporting date	$ 1	$ 1