Available-for-Sale Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014 Nuclear Decommissioning Trust Funds [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member]	Mar. 31, 2014 Nuclear Decommissioning Trust Funds [Member] Cash And Cash Equivalents [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Cash And Cash Equivalents [Member]	Mar. 31, 2014 Nuclear Decommissioning Trust Funds [Member] Equity Securities [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Equity Securities [Member]	Mar. 31, 2014 Nuclear Decommissioning Trust Funds [Member] Debt Securities [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Debt Securities [Member]	Mar. 31, 2014 Nuclear Decommissioning Trust Funds [Member] Receivables Payables Net [Member]	Dec. 31, 2013 Nuclear Decommissioning Trust Funds [Member] Receivables Payables Net [Member]	Mar. 31, 2014 Auction Rate Securities [Member]	Dec. 31, 2013 Auction Rate Securities [Member]	Mar. 31, 2014 PPL Energy Supply LLC [Member]		Mar. 31, 2013 PPL Energy Supply LLC [Member]		Mar. 31, 2014 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member]	Dec. 31, 2013 PPL Energy Supply LLC [Member] Nuclear Decommissioning Trust Funds [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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					$ 503	$ 497	$ 13	$ 14	$ 271	$ 265	$ 218	$ 217	$ 1	$ 1	$ 17	$ 20					$ 503	$ 497	$ 13	$ 14	$ 271	$ 265	$ 218	$ 217	$ 1	$ 1	$ 14	$ 17
Gross unrealized gains					377	370			368	363	9	7									377	370			368	363	9	7
Gross unrealized losses					1	3					1	3			1	1					1	3					1	3			1	1
Fair value					879	864	13	14	639	628	226	221	1	1	16	19					879	864	13	14	639	628	226	221	1	1	13	16
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]
Amortized cost - maturity less than 1 year	11																11
Amortized cost - maturity between 1 and 5 years	88																88
Amortized cost - maturity between 6 and 10 years	57																57
Amortized cost - maturity in excess of 10 years	79																76
Amortized cost total	235																232
Fair value - maturity less than 1 year	11																11
Fair value - maturity between 1 and 5 years	90																90
Fair value - maturity between 6 and 10 years	59																59
Fair value - maturity in excess of 10 years	82																79
Fair value total	242																239
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]
Proceeds from sales of NDT securities	27		24														27		24
Other proceeds from sales	3																3
Gross realized gains	3	[1]	4	[1]													3	[1]	4	[1]
Gross realized losses	$ 1	[1]	$ 2	[1]													$ 1	[1]	$ 2	[1]

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