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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, after Adjustment to Retained Earnings, Basic Earnings |  |  |  |  |  |  |  |  | $ (507) | $ (25) | [1] | $ 318
Weighted Average Number of Shares Outstanding, Basic (in shares) |  |  |  |  |  |  |  |  | 660 | 660 |  | 687
Income (Loss) from Continuing Operations, Per Basic Share | $ (1.03) | $ 0.22 | $ 0.08 | $ 0.04 | $ (0.35) | $ 0.26 | $ (0.15) | $ 0.21 | $ (0.77) | $ (0.04) |  | $ 0.46
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in shares) |  |  |  |  |  |  |  |  | 0 | 0 |  | 2
Weighted Average Number of Shares Outstanding, Diluted (in shares) |  |  |  |  |  |  |  |  | 660 | 660 |  | 689
Income (Loss) from Continuing Operations, Per Diluted Share | $ (1.03) | $ 0.22 | $ 0.08 | $ 0.04 | $ (0.35) | $ 0.26 | $ (0.15) | $ 0.20 | $ (0.77) | $ (0.04) |  | $ 0.46
Income (loss) from continuing operations, after Adjustment to Retained Earnings, Diluted Earnings |  |  |  |  |  |  |  |  | $ (507) | $ (25) |  | $ 318
Temporary Equity, Accretion to Redemption Value |  |  |  |  |  |  |  |  | $ 25 | $ 4 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations, Per Diluted Share |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 |  | $ 0.00
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
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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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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