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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Basic and diluted net earnings per share: |  |  |  |  |
Net income |  | $ 88 | $ 106 | $ 226 | $ 241
Shares |  |  |  |  |
Weighted average common shares outstanding |  | 180,815 | 182,196 | 181,428 | 183,343
Add: Participating securities | [1] | 30 | 48 | 43 | 46
Weighted average common shares outstanding - Basic (in shares) |  | 180,845 | 182,244 | 181,471 | 183,389
Plus incremental shares from assumed conversions: |  |  |  |  |
Weighted average common shares outstanding - Diluted (in shares) |  | 181,632 | 183,432 | 182,336 | 184,573
Basic earnings per share (usd per share) |  | $ 0.48 | $ 0.58 | $ 1.25 | $ 1.31
Diluted earnings per share (usd per share) |  | $ 0.48 | $ 0.58 | $ 1.24 | $ 1.31
Stock Options |  |  |  |  |
Plus incremental shares from assumed conversions: |  |  |  |  |
Dilutive effect of common shares | [2] | 424 | 646 | 489 | 655
Restricted Stock |  |  |  |  |
Plus incremental shares from assumed conversions: |  |  |  |  |
Dilutive effect of common shares | [2] | 363 | 542 | 376 | 529
[1] | Restricted stock awards containing rights to non-forfeitable dividends that participate in undistributed earnings with common shareholders are considered participating securities for purposes of computing earnings per share
[2] | Incremental shares from stock options, restricted stock and performance share units are computed by the treasury stock method. The weighted average shares listed below were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the periods presented or were otherwise excluded under the treasury stock method. The treasury stock method calculates dilution assuming the exercise of all in-the-money options and vesting of restricted stock and performance share awards, reduced by the repurchase of shares with the proceeds from the assumed exercises, unrecognized compensation expense for outstanding awards and the estimated tax benefit of the assumed exercises. Performance share units will be included in the treasury stock calculation of diluted earnings per share upon achievement of underlying performance conditions. See Note 14, "Share-Based Compensation Plans" for further detail on the performance share units. Three Months Ended Nine Months Ended September 30, September 30,(in thousands)2015 2014 2015 2014Stock options2,703 2,709 2,712 2,769Restricted stock747 534 754 532Performance shares191 136 187 114

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- Definition This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 61A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780137-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Participating Security -URI http://asc.fasb.org/extlink&oid=6519812 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 59A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780131-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 68B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5498026-109256 + Details
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