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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
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:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: | (in millions, except share and per share amounts)
Net income attributable to common shareholders | $ | 163 |  |  | $ | 170 |  |  | $ | 502 |  |  | $ | 483 |
Denominator: |  |  |  |  |  |  |
Weighted-average common shares outstanding for basic earnings per share | 164,227,243 |  |  | 166,694,755 |  |  | 165,622,428 |  |  | 166,195,433 |
Weighted-average effect of dilutive securities: |  |  |  |  |  |  |
Employee equity awards(1) | 2,071,426 |  |  | 2,315,145 |  |  | 1,931,307 |  |  | 3,036,349 |
Contingent issuance of common stock | 992,247 |  |  | 992,247 |  |  | 330,749 |  |  | 334,384 |
Weighted-average common shares outstanding for diluted earnings per share | 167,290,916 |  |  | 170,002,147 |  |  | 167,884,484 |  |  | 169,566,166 |
Basic and diluted earnings per share: |  |  |  |  |  |  |
Basic earnings per share | $ | 0.99 |  |  | $ | 1.02 |  |  | $ | 3.03 |  |  | $ | 2.91 |
Diluted earnings per share | $ | 0.97 |  |  | $ | 1.00 |  |  | $ | 2.99 |  |  | $ | 2.85 |
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(1) | PSUs, which are considered contingently issuable, are included in the computation of dilutive earnings per share on a weighted average basis when management determines the related performance criteria are met.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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