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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details) $ in Millions, £ in Billions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 GBP (£) | Sep. 30, 2016 GBP (£)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  |  | $ 0 | $ 0 |  |  |
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net |  |  | $ 0 |  | $ 0 |  |
Cash Flow Hedges [Member] | Cross Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |  |  |
Earliest maturity date of cross-currency cash flow hedge contracts |  |  | 2021 |  |  |  |
Latest maturity date of cross-currency cash flow hedge contracts |  |  | 2028 |  |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  |  | $ 0 | 0 | 0 |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |  |
Notional amount |  |  | 702 |  |  |  |
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 |  |  | $ 2,200 |  |  | £ 1.5 |
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity |  |  | Jan. 31, 2019 |  |  |  |
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity |  |  | Oct. 30, 2020 |  |  |  |
Economic Hedges [Member] | Foreign Currency Contracts [Member] | Hedges 2017 and 2018 [Member] |  |  |  |  |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |  |
Notional amount |  | $ 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 |  | Jan. 31, 2017 |  |  |  |  |
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity |  | Nov. 30, 2018 |  |  |  |  |
Derivative Cash Received On Hedge |  | $ 310 |  |  |  |  |
Net Investment Hedges [Member] | Foreign Currency Contracts [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 |  |  | $ 31 | 22 |  |  |
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |  |
Notional amount |  |  | 147 |  |  |  |
Notional amount of terminated swaps | $ 32 |  |  |  |  |  |
Net cash settlements on terminated interest rate swaps |  |  | $ 9 |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts |  |  | 2033 |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |  |
Net cash settlements on terminated interest rate swaps |  |  | $ 0 | 0 | 9 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |  |
Notional amount |  |  | 147 |  |  |  |
Notional amount of terminated swaps | 32 |  |  |  |  |  |
Net cash settlements on terminated interest rate swaps |  |  | $ 9 |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts |  |  | 2033 |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |  |
Net cash settlements on terminated interest rate swaps |  |  | $ 0 | $ 0 | $ 9 |  |
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |  |
Notional amount |  |  | 147 |  |  |  |
Notional amount of terminated swaps | $ 32 |  |  |  |  |  |
Net cash settlements on terminated interest rate swaps |  |  | $ 9 |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts |  |  | 2033 |  |  |  |

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