Available-for-Sale Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended																3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014 Nuclear Decommissioning Trust Funds [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member]	Sep. 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]	Sep. 30, 2014 Nuclear Decommissioning Trust Funds [Member] Equity Securities [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Equity Securities [Member]	Sep. 30, 2014 Nuclear Decommissioning Trust Funds [Member] Debt Securities [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Debt Securities [Member]	Sep. 30, 2014 Nuclear Decommissioning Trust Funds [Member] Receivables Payables Net [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Receivables Payables Net [Member]	Sep. 30, 2014 Auction Rate Securities [Member]	Dec. 31, 2013 Auction Rate Securities [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member]		Sep. 30, 2013 PPL Energy Supply LLC [Member]		Sep. 30, 2014 PPL Energy Supply LLC [Member]		Sep. 30, 2013 PPL Energy Supply LLC [Member]		Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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									$ 517	$ 497	$ 17	$ 14	$ 281	$ 265	$ 217	$ 217	$ 2	$ 1	$ 14	$ 20									$ 517	$ 497	$ 17	$ 14	$ 281	$ 265	$ 217	$ 217	$ 2	$ 1	$ 11	$ 17
Gross unrealized gains									395	370	0	0	384	363	11	7	0	0	0	0									395	370	0	0	384	363	11	7	0	0	0	0
Gross unrealized losses									1	3	0	0	0	0	1	3	0	0	1	1									1	3	0	0	0	0	1	3	0	0	1	1
Fair value									911	864	17	14	665	628	227	221	2	1	13	19									911	864	17	14	665	628	227	221	2	1	10	16
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]
Amortized cost - maturity less than 1 year	13				13																13				13
Amortized cost - maturity between 1 and 5 years	85				85																85				85
Amortized cost - maturity between 6 and 10 years	58				58																58				58
Amortized cost - maturity in excess of 10 years	75				75																72				72
Amortized cost total	231				231																228				228
Fair value - maturity less than 1 year	13				13																13				13
Fair value - maturity between 1 and 5 years	87				87																87				87
Fair value - maturity between 6 and 10 years	61				61																61				61
Fair value - maturity in excess of 10 years	79				79																76				76
Fair value total	240				240																237				237
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]
Proceeds from sales of NDT securities	47	[1]	33	[1]	112		92														47	[1]	33	[1]	112		92
Other proceeds from sales	3		0		6		0														3		0		6		0
Gross realized gains	9	[2]	3	[2]	17	[2]	10	[2]													9	[2]	3	[2]	17	[2]	10	[2]
Gross realized losses	$ 2	[2]	$ 2	[2]	$ 6	[2]	$ 6	[2]													$ 2	[2]	$ 2	[2]	$ 6	[2]	$ 6	[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.