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Earnings Per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | 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.
There were no securities that were antidilutive for both the three and nine months ended September 30, 2018. Securities that were not included in the computation of diluted earnings per share because their effect was antidilutive totaled 179,712 for the three months ended September 30, 2017 and 325,187 for the nine months ended September 30, 2017.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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