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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Summary of Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (in millions, except share and per share amounts)
Numerator: |  |  |  |  |
Net income attributable to common shareholders | $ | 108 |  |  | $ | 428 |  |  | $ | 414 |
Denominator: |  |  |  |  |
Weighted-average common shares outstanding for basic earnings per share | 165,182,290 |  |  | 167,285,450 |  |  | 168,926,733 |
Weighted-average effect of dilutive securities: |  |  |  |  |
Employee equity awards | 3,258,136 |  |  | 3,638,981 |  |  | 3,727,839 |
Contingent issuance of common stock | 360,571 |  |  | 358,840 |  |  | 364,277 |
Weighted-average common shares outstanding for diluted earnings per share | 168,800,997 |  |  | 171,283,271 |  |  | 173,018,849 |
Basic and diluted earnings per share: |  |  |  |  |
Basic earnings per share | $ | 0.65 |  |  | $ | 2.56 |  |  | $ | 2.45 |
Diluted earnings per share | $ | 0.64 |  |  | $ | 2.50 |  |  | $ | 2.39 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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