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Financing Activities - Long-term Debt and ATM Program (Details) shares in Thousands, £ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 GBP (£) | Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) | Mar. 31, 2018 GBP (£) | Feb. 28, 2018 USD ($)
At-the-Market Stock Offering Program (Numeric) [Abstract] |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  | $ 100 | $ 73 |  |
WPD South Wales PLC [Member] | Index Linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  | £ 30 |
Stated interest rate |  | 0.01% |  | 0.01% |  | 0.01% |
Proceeds from debt, net of issuance costs | £ |  |  | £ 31 |  |  |  |
Maturity date |  | Dec. 31, 2036 | Dec. 31, 2036 |  |  |  |
Proceeds from debt, including premium net of debt issuance costs |  | $ 44 |  |  |  |  |
LGE [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount |  | $ 28 |  | $ 28 |  |  |
Stated interest rate |  | 2.30% |  | 2.30% |  | 2.30% |
Maturity date |  | Dec. 31, 2026 | Dec. 31, 2026 |  |  |  |
Repurchase date of debt instruments |  | Sep. 01, 2021 | Sep. 01, 2021 |  |  |  |
LGE [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount | $ 35 |  |  |  |  |  |
Stated interest rate | 2.55% |  |  |  |  |  |
Maturity date | Dec. 31, 2027 |  |  |  |  |  |
Repurchase date of debt instruments | May 03, 2021 |  |  |  |  |  |
LGE [Member] | Senior Debt Obligations [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount | $ 35 |  |  |  |  |  |
Stated interest rate | 2.55% |  |  |  |  |  |
Maturity date | Dec. 31, 2027 |  |  |  |  |  |
Repurchase date of debt instruments | May 03, 2021 |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount |  | $ 28 |  | $ 28 |  |  |
Stated interest rate |  | 2.30% |  | 2.30% |  | 2.30% |
Maturity date |  | Dec. 31, 2026 | Dec. 31, 2026 |  |  |  |
Repurchase date of debt instruments |  | Sep. 01, 2021 | Sep. 01, 2021 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount | $ 35 |  |  |  |  |  |
Stated interest rate | 2.55% |  |  |  |  |  |
Maturity date | Dec. 31, 2027 |  |  |  |  |  |
Repurchase date of debt instruments | May 03, 2021 |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Debt Obligations [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount | $ 35 |  |  |  |  |  |
Stated interest rate | 2.55% |  |  |  |  |  |
Maturity date | Dec. 31, 2027 |  |  |  |  |  |
Repurchase date of debt instruments | May 03, 2021 |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | Affiliated Entity [Member] | Note Payable [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Stated interest rate | 4.00% |  |  |  |  |  |
Maturity date | May 31, 2028 |  |  |  |  |  |
Notes Payable, Noncurrent | $ 250 |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2001 Series A [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount |  | $ 28 |  | $ 28 |  |  |
Stated interest rate |  | 2.30% |  | 2.30% |  | 2.30% |
Maturity date |  | Dec. 31, 2026 | Dec. 31, 2026 |  |  |  |
Repurchase date of debt instruments |  | Sep. 01, 2021 | Sep. 01, 2021 |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount | $ 35 |  |  |  |  |  |
Stated interest rate | 2.55% |  |  |  |  |  |
Maturity date | Dec. 31, 2027 |  |  |  |  |  |
Repurchase date of debt instruments | May 03, 2021 |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |
Principal amount | $ 35 |  |  |  |  |  |
Stated interest rate | 2.55% |  |  |  |  |  |
Maturity date | Dec. 31, 2027 |  |  |  |  |  |
Repurchase date of debt instruments | May 03, 2021 |  |  |  |  |  |
At The Market Stock Offering Program [Member] |  |  |  |  |  |  |
At-the-Market Stock Offering Program (Numeric) [Abstract] |  |  |  |  |  |  |
Aggregate sales price of common stock based on two separate equity distribution agreements |  |  |  |  |  |  | $ 1,000
Stock Issued During Period, Shares, New Issues | shares |  |  |  | 3,000 |  |  |
Net proceeds from issuance of common stock |  |  |  | $ 85 |  |  |

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