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Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 25 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018
Earnings Per Share [Abstract] |  |  |
Target Achievement Percentage | 100.00% |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 7,600,000 | 7,300,000 |
Stock Repurchases [Line Items] |  |  |
Shares Repurchased and Retired During Period, Shares | 3,700,000 |  | 20,200,000
Shares Repurchased and Retired During Period, Value | $ 99 |  |
Weighted Average Market Price of Shares Repurchased and Retired During Period | $ 26.58 |  | $ 28.36
Common Stock Settlement Date after Period End |  |  |
Stock Repurchases [Line Items] |  |  |
Shares Repurchased and Retired During Period, Shares | 202,860 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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