For the three months ended September 30, 2016, PPL had no hedge ineffectiveness associated with interest rate derivatives and an insignificant amount of hedge ineffectiveness for the three months ended September 30, 2015. For the nine months ended September 30, 2016 and 2015, PPL had an insignificant amount of ineffectiveness associated with interest rate derivatives.

No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts

PPL had no cash flow hedges reclassified into earnings associated with discontinued cash flow hedges for the three and nine months ended September 30, 2016.

No or insignificant unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months

At September 30, 2016, the accumulated net unrecognized after-tax gains (losses) on qualifying derivatives that are expected to be reclassified into earnings during the next 12 months were insignificant.

Economic Hedges [Member] | Interest Rate Swap Contracts [Member]

Interest Rate Risk And Foreign Currency Risk [Line Items]

Notional amount

179

$ 179

Interest Rate Risk - Economic Activity (Numeric) [Abstract]

Year of expiration of the maximum maturity date of interest rate economic activity contracts

2033

Economic Hedges [Member] | Foreign Currency Contracts [Member]

Foreign Currency Risk - Economic Activity (Numeric) [Abstract]

Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity

2,400

$ 2,400

£ 1.8

Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity

October 2016

Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity

December 2018

Cash received on hedge settlement

310

Economic Hedges [Member] | Foreign Currency Contracts [Member] | 2017 And 2018 Hedges [Member]

Interest Rate Risk And Foreign Currency Risk [Line Items]

Notional amount

2,000

$ 2,000

£ 1.3

Foreign Currency Risk - Economic Activity (Numeric) [Abstract]

Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity

January 2017

Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity

November 2018

Net Investment Hedges [Member] | Combined Foreign Currency Contracts And Intercompany Loans [Member]

Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]

Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI

$ 22

$ 19

LG And E And KU Energy LLC [Member] | Economic Hedges [Member] | Interest Rate Swap Contracts [Member]

Interest Rate Risk And Foreign Currency Risk [Line Items]

Notional amount

179

$ 179

Interest Rate Risk - Economic Activity (Numeric) [Abstract]

Year of expiration of the maximum maturity date of interest rate economic activity contracts

2033

Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swap Contracts [Member]

Interest Rate Risk And Foreign Currency Risk [Line Items]

Notional amount

$ 179

Interest Rate Risk - Economic Activity (Numeric) [Abstract]

Year of expiration of the maximum maturity date of interest rate economic activity contracts

2033

Derivative Instruments and Hedging Activities - Risk Disclosures (Details) $ in Millions, £ in Billions	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	May 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2016 GBP (£)
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Repayment of senior notes	$ 460
Cash Flow Hedges [Member] \| Cross Currency Interest Rate Swap Contracts [Member]
Interest Rate Risk And Foreign Currency Risk [Line Items]
Notional amount		$ 802	$ 802
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Earliest maturity date of cross-currency cash flow hedge contracts			2017
Latest maturity date of cross-currency cash flow hedge contracts			2028
Notional amount matured		460	$ 460
Gain (loss) recognized in income upon settlement of cross-currency interest rate swap contracts			$ 46
Cash Flow Hedges [Member] \| Interest Rate Swap Contracts [Member]
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Insignificant or no hedge ineffectiveness associated with interest rate cash flow hedges			For the three months ended September 30, 2016, PPL had no hedge ineffectiveness associated with interest rate derivatives and an insignificant amount of hedge ineffectiveness for the three months ended September 30, 2015. For the nine months ended September 30, 2016 and 2015, PPL had an insignificant amount of ineffectiveness associated with interest rate derivatives.
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts			PPL had no cash flow hedges reclassified into earnings associated with discontinued cash flow hedges for the three and nine months ended September 30, 2016.
No or insignificant unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months			At September 30, 2016, the accumulated net unrecognized after-tax gains (losses) on qualifying derivatives that are expected to be reclassified into earnings during the next 12 months were insignificant.
Economic Hedges [Member] \| Interest Rate Swap Contracts [Member]
Interest Rate Risk And Foreign Currency Risk [Line Items]
Notional amount		179	$ 179
Interest Rate Risk - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate economic activity contracts			2033
Economic Hedges [Member] \| Foreign Currency Contracts [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity		2,400	$ 2,400		£ 1.8
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity			October 2016
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity			December 2018
Cash received on hedge settlement		310
Economic Hedges [Member] \| Foreign Currency Contracts [Member] \| 2017 And 2018 Hedges [Member]
Interest Rate Risk And Foreign Currency Risk [Line Items]
Notional amount		2,000	$ 2,000		£ 1.3
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity			January 2017
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity			November 2018
Net Investment Hedges [Member] \| Combined Foreign Currency Contracts And Intercompany Loans [Member]
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]
Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI			$ 22	$ 19
LG And E And KU Energy LLC [Member] \| Economic Hedges [Member] \| Interest Rate Swap Contracts [Member]
Interest Rate Risk And Foreign Currency Risk [Line Items]
Notional amount		179	$ 179
Interest Rate Risk - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate economic activity contracts			2033
Louisville Gas And Electric Co [Member] \| Economic Hedges [Member] \| Interest Rate Swap Contracts [Member]
Interest Rate Risk And Foreign Currency Risk [Line Items]
Notional amount		$ 179	$ 179
Interest Rate Risk - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate economic activity contracts			2033