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Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 13 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017
Earnings Per Share [Abstract] |  |  |
Target Achievement Percentage | 100.00% |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 7,300,000 | 6,000,000 |
Stock Repurchases [Abstract] |  |  |
Shares Repurchased and Retired During Period, Shares | 2,200,000 |  | 9,300,000
Shares Repurchased and Retired During Period, Value | $ 60 |  | $ 259
Weighted Average Market Price of Shares Repurchased and Retired During Period | $ 27.82 |  | $ 27.93
Common Stock Settlement Date after Period End [Member] |  |  |
Stock Repurchases [Abstract] |  |  |
Shares Repurchased and Retired During Period, Shares | 226,352 |  |

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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 -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: 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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