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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  | $ 985 | $ (507) | $ (20)
Income (loss) from continuing operations, after Adjustment to Retained Earnings, Basic Earnings | [1] |  |  |  |  |  |  |  |  |  |  | $ (25)
Weighted Average Number of Shares Outstanding, Basic (in shares) |  |  |  |  |  |  |  |  |  | 662 | 660 | 660
Income (Loss) from Continuing Operations, Per Basic Share |  | $ 0.15 | $ 0.15 | $ 0.15 | $ 1.04 | $ (1.03) | $ 0.22 | $ 0.08 | $ (0.04) | $ 1.49 | $ (0.77) | $ (0.04)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in shares) |  |  |  |  |  |  |  |  |  | 3 | 0 | 0
Weighted Average Number of Shares Outstanding, Diluted (in shares) |  |  |  |  |  |  |  |  |  | 665 | 660 | 660
Income (Loss) from Continuing Operations, Per Diluted Share |  | $ 0.15 | $ 0.15 | $ 0.15 | $ 1.03 | $ (1.03) | $ 0.22 | $ 0.08 | $ (0.04) | $ 1.48 | $ (0.77) | $ (0.04)
Income (loss) from continuing operations, after Adjustment to Retained Earnings, Diluted Earnings | [1] |  |  |  |  |  |  |  |  |  |  | $ (25)
Temporary Equity, Accretion to Redemption Value |  |  |  |  |  |  |  |  |  | $ 4 | $ 25 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Dilutive Securities Effect On Basic EPS, dilutive Restricted Stock Units, per diluted share |  |  |  |  |  |  |  |  |  | $ (0.01) | $ 0 | $ 0
DPL Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity, Accretion to Redemption Value |  |  |  |  |  |  |  |  |  |  |  | $ 5
[1] | Loss from continuing operations, net of tax, of $20 million less the $5 million adjustment to retained earnings to record the DP&L redeemable preferred stock at its redemption value as of December 31, 2016.

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