Available-for-Sale Securities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]
Amortized cost - maturity less than 1 year	$ 7
Amortized cost - maturity between 1 and 5 years	97
Amortized cost - maturity between 6 and 10 years	54
Amortized cost - maturity in excess of 10 years	79
Amortized cost total	237
Fair value - maturity less than 1 year	7
Fair value - maturity between 1 and 5 years	99
Fair value - maturity between 6 and 10 years	55
Fair value - maturity in excess of 10 years	79
Fair value total	240
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]
Proceeds from sales of NDT securities	144		139		156
Other proceeds from sales			5		163
Gross realized gains	17	[1]	29	[1]	28	[1]
Gross realized losses	7	[1]	21	[1]	16	[1]
Short Term Investments (Numeric) [Abstract]
Principal amount of tax-exempt revenue bonds held as short-term investment							163
Proceeds received from the remarketing of certain Kentucky tax-exempt revenue bonds					163
Nuclear Decommissioning Trust Funds [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	497		474
Gross unrealized gains	370		239
Gross unrealized losses	3		1
Fair value	864		712
Nuclear Decommissioning Trust Funds (Numeric) [Abstract]
Percentage of shortfall PPL Susquehanna would be obligated to fund	90.00%
Impairments recorded to NDT securities					6
Nuclear Decommissioning Trust Funds [Member] | Cash And Cash Equivalents [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	14		11
Gross unrealized gains
Gross unrealized losses
Fair value	14		11
Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	265		252
Gross unrealized gains	363		220
Gross unrealized losses
Fair value	628		472
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	217		211
Gross unrealized gains	7		19
Gross unrealized losses	3		1
Fair value	221		229
Nuclear Decommissioning Trust Funds [Member] | Receivables Payables Net [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	1
Gross unrealized gains
Gross unrealized losses
Fair value	1
Auction Rate Securities [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	20		20
Gross unrealized gains
Gross unrealized losses	1		1
Fair value	19		19
PPL Energy Supply LLC [Member]
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]
Amortized cost - maturity less than 1 year	7
Amortized cost - maturity between 1 and 5 years	97
Amortized cost - maturity between 6 and 10 years	54
Amortized cost - maturity in excess of 10 years	76
Amortized cost total	234
Fair value - maturity less than 1 year	7
Fair value - maturity between 1 and 5 years	99
Fair value - maturity between 6 and 10 years	55
Fair value - maturity in excess of 10 years	76
Fair value total	237
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]
Proceeds from sales of NDT securities	144		139		156
Other proceeds from sales			3
Gross realized gains	17	[1]	29	[1]	28	[1]
Gross realized losses	7	[1]	21	[1]	16	[1]
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	497		474
Gross unrealized gains	370		239
Gross unrealized losses	3		1
Fair value	864		712
Nuclear Decommissioning Trust Funds (Numeric) [Abstract]
Percentage of shortfall PPL Susquehanna would be obligated to fund	90.00%
Impairments recorded to NDT securities					6
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Cash And Cash Equivalents [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	14		11
Gross unrealized gains
Gross unrealized losses
Fair value	14		11
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	265		252
Gross unrealized gains	363		220
Gross unrealized losses
Fair value	628		472
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	217		211
Gross unrealized gains	7		19
Gross unrealized losses	3		1
Fair value	221		229
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Receivables Payables Net [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	1
Gross unrealized gains
Gross unrealized losses
Fair value	1
PPL Energy Supply LLC [Member] | Auction Rate Securities [Member]
Available-for-Sale Securities Balance Sheet (Details) [Abstract]
Amortized cost	17		17
Gross unrealized gains
Gross unrealized losses	1		1
Fair value	16		16
LG And E And KU Energy LLC [Member]
Short Term Investments (Numeric) [Abstract]
Principal amount of tax-exempt revenue bonds held as short-term investment							163
Proceeds received from the remarketing of certain Kentucky tax-exempt revenue bonds					163
Louisville Gas And Electric Co [Member]
Short Term Investments (Numeric) [Abstract]
Principal amount of tax-exempt revenue bonds held as short-term investment							163
Proceeds received from the remarketing of certain Kentucky tax-exempt revenue bonds					$ 163

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