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Financing Activities - Long-term Debt and ATM Program (Details) $ / shares in Units, shares in Thousands, £ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | May 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 GBP (£) | Feb. 28, 2015 USD ($) Integer | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares
At-the-Market Stock Offering Program (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 275 | $ 133
WPD South Wales PLC [Member] | Index Linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  | £ 50 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 0.01% |  |  |  |  |
Proceeds from debt, net of issuance costs | £ |  |  |  |  |  |  | £ 53 |  |  |  |  |
Maturity date |  |  |  |  |  | Mar. 31, 2029 | Mar. 31, 2029 |  |  |  |  |
Proceeds from debt, including premium net of debt issuance costs |  |  |  |  |  | $ 64 |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Debt Obligations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 500 |  |  |  |  |  |  |  | $ 500 |  | $ 500 |
Stated interest rate | 4.00% |  |  |  |  |  |  |  | 4.00% |  | 4.00% |
Maturity date | Dec. 31, 2047 |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, including premium net of debt issuance costs | $ 490 |  |  |  |  |  |  |  |  |  |  |
PPL Electric [Member] | First Mortgage [Member] | Mortgage Indenture 2001 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 475 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.95% |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  | $ 466 |  |  |  |  |  |  |  |
Maturity date |  |  |  | Dec. 31, 2047 |  |  |  |  |  |  |  |
PPL Electric [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 108 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.80% |  |  |  |  |  |  |  |  |  |
Maturity date |  | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  | Aug. 15, 2022 |  |  |  |  |  |  |  |  |  |
PPL Electric [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 116 |  |  |  |  |  |  |  | $ 116 |  | $ 116 |
Stated interest rate | 1.80% |  |  |  |  |  |  |  | 1.80% |  | 1.80% |
Maturity date | Dec. 31, 2029 |  |  |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments | Sep. 01, 2022 |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 128 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.50% |  |  |  |  |  |  |
Maturity date |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  |  |  | Apr. 01, 2019 |  |  |  |  |  |  |
LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2017 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 60 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.75% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 01, 2027 |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 60 |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 31 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.25% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.25% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | First Mortgage [Member] | Mortgage Indenture 2001 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 475 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.95% |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  | $ 466 |  |  |  |  |  |  |  |
Maturity date |  |  |  | Dec. 31, 2047 |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 108 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.80% |  |  |  |  |  |  |  |  |  |
Maturity date |  | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  | Aug. 15, 2022 |  |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Debt Obligations [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 116 |  |  |  |  |  |  |  | $ 116 |  | $ 116 |
Stated interest rate | 1.80% |  |  |  |  |  |  |  | 1.80% |  | 1.80% |
Maturity date | Dec. 31, 2029 |  |  |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments | Sep. 01, 2022 |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 128 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.50% |  |  |  |  |  |  |
Maturity date |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  |  |  | Apr. 01, 2019 |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2017 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 60 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.75% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 01, 2027 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 60 |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 31 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.25% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.25% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 128 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.50% |  |  |  |  |  |  |
Maturity date |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  |  |  | Apr. 01, 2019 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2017 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 60 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.75% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 01, 2027 |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 60 |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 31 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.25% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Environmental Facilities Revenue Refunding Bonds 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.25% |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |
Repurchase date of debt instruments |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |
At The Market Stock Offering Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
At-the-Market Stock Offering Program (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of distribution agreements | Integer |  |  |  |  |  |  |  | 2 |  |  |  |
Aggregate sales price of common stock based on two separate equity distribution agreements |  |  |  |  |  |  |  | $ 500 |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  |  |  |  |  | 2,049 | 710 | 5,526 | 710
Average share price | $ / shares |  |  |  |  |  |  |  |  | $ 39.04 | $ 35.23 | $ 38.49 | $ 35.23
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | $ 79 | $ 25 | $ 211 | $ 25

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