Available-for-Sale Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended																3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014 Nuclear Decommissioning Trust Funds [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member]	Jun. 30, 2014 Nuclear Decommissioning Trust Funds [Member] Cash And Cash Equivalents [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Cash And Cash Equivalents [Member]	Jun. 30, 2014 Nuclear Decommissioning Trust Funds [Member] Equity Securities [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Equity Securities [Member]	Jun. 30, 2014 Nuclear Decommissioning Trust Funds [Member] Debt Securities [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Debt Securities [Member]	Jun. 30, 2014 Nuclear Decommissioning Trust Funds [Member] Receivables Payables Net [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Receivables Payables Net [Member]	Jun. 30, 2014 Auction Rate Securities [Member]	Dec. 31, 2013 Auction Rate Securities [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member]		Jun. 30, 2013 PPL Energy Supply LLC [Member]		Jun. 30, 2014 PPL Energy Supply LLC [Member]		Jun. 30, 2013 PPL Energy Supply LLC [Member]		Jun. 30, 2014 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member] Cash And Cash Equivalents [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member] Cash And Cash Equivalents [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member] Equity Securities [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member] Equity Securities [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member] Debt Securities [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member] Debt Securities [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member] Receivables Payables Net [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member] Receivables Payables Net [Member]	Jun. 30, 2014 PPL Energy Supply LLC [Member] Auction Rate Securities [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Auction Rate Securities [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost									$ 508	$ 497	$ 16	$ 14	$ 272	$ 265	$ 218	$ 217	$ 2	$ 1	$ 17	$ 20									$ 508	$ 497	$ 16	$ 14	$ 272	$ 265	$ 218	$ 217	$ 2	$ 1	$ 14	$ 17
Gross unrealized gains									404	370			393	363	11	7													404	370			393	363	11	7
Gross unrealized losses									1	3					1	3			1	1									1	3					1	3			1	1
Fair value									911	864	16	14	665	628	228	221	2	1	16	19									911	864	16	14	665	628	228	221	2	1	13	16
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]
Amortized cost - maturity less than 1 year	8				8																8				8
Amortized cost - maturity between 1 and 5 years	89				89																89				89
Amortized cost - maturity between 6 and 10 years	60				60																60				60
Amortized cost - maturity in excess of 10 years	78				78																75				75
Amortized cost total	235				235																232				232
Fair value - maturity less than 1 year	8				8																8				8
Fair value - maturity between 1 and 5 years	91				91																91				91
Fair value - maturity between 6 and 10 years	63				63																63				63
Fair value - maturity in excess of 10 years	82				82																79				79
Fair value total	244				244																241				241
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]
Proceeds from sales of NDT securities	38	[1]	35	[1]	65		59														38	[1]	35	[1]	65		59
Other proceeds from sales					3																				3
Gross realized gains	5	[2]	3	[2]	8	[2]	7	[2]													5	[2]	3	[2]	8	[2]	7	[2]
Gross realized losses	$ 3	[2]	$ 2	[2]	$ 4	[2]	$ 4	[2]													$ 3	[2]	$ 2	[2]	$ 4	[2]	$ 4	[2]

[1] These proceeds are used to pay income taxes and fees related to managing the trust. Remaining proceeds are reinvested in the trust.

[2] Excludes the impact of other-than-temporary impairment charges recognized on the Statements of Income.