Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Depreciation [Line Items]
Reduction in depreciation expense in 2013 as a result of lower depreciation rates			$ 19
Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	220	184	479	422
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	220	184	479	422
PPL Electric Utilities Corp [Member] | Affiliated Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	70	74	147	156
LG And E And KU Energy LLC [Member]
Depreciation [Line Items]
Reduction in depreciation expense in 2013 as a result of lower depreciation rates			19
Louisville Gas And Electric Co [Member]
Depreciation [Line Items]
Reduction in depreciation expense in 2013 as a result of lower depreciation rates			9
Kentucky Utilities Co [Member]
Depreciation [Line Items]
Reduction in depreciation expense in 2013 as a result of lower depreciation rates			$ 10