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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
--- | --- | ---
Apr. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 GBP (£) | Feb. 26, 2015 USD ($) Integer | Mar. 31, 2017 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares
At-the-Market Stock Offering Program (Numeric) [Abstract] |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  | $ 73 | $ 42
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. 14, 2029 | Mar. 14, 2029 |  |  |
Proceeds from debt, including premium net of debt issuance costs |  | $ 64 |  |  |  |
Louisville Gas And Electric Company [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |
Principal amount | $ 128 |  |  |  |  |
Stated interest rate | 1.50% |  |  |  |  |
Maturity date | Oct. 01, 2033 |  |  |  |  |
Repurchase date of debt instruments | Apr. 01, 2019 |  |  |  |  |
LG And E And KU Energy LLC [Member] | Louisville Gas And Electric Company [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |
Principal amount | $ 128 |  |  |  |  |
Stated interest rate | 1.50% |  |  |  |  |
Maturity date | Oct. 01, 2033 |  |  |  |  |
Repurchase date of debt instruments | Apr. 01, 2019 |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Debt Obligations [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |
Principal amount | $ 128 |  |  |  |  |
Stated interest rate | 1.50% |  |  |  |  |
Maturity date | Oct. 01, 2033 |  |  |  |  |
Repurchase date of debt instruments | Apr. 01, 2019 |  |  |  |  |
At The Market Stock Offering Program [Member] |  |  |  |  |  |
Equity Programs [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  | 1,364 | 0
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 |  |
Average share price | $ / shares |  |  |  |  | $ 36.66 | $ 0.00
Net proceeds from issuance of common stock |  |  |  |  | $ 50 | $ 0

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