Earnings per Share

Basic earnings per share for all periods presented equals net income (loss) divided by the weighted average number of our shares outstanding during the period including participating securities. Diluted earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of our shares outstanding during the period including participating securities, adjusted for the dilutive effect of our stock options, restricted shares and performance units.

The following discloses basic and diluted weighted average shares outstanding:



	Year Ended December 31,
(Shares in millions)	2017	2016	2015
Basic and Diluted Weighted Average Shares Outstanding	990	887	779

Our basic and diluted weighted average shares outstanding for the years ended December 31, 2017, 2016 and 2015, are equivalent due to the net loss attributable to shareholders. Diluted weighted average shares outstanding for the years ended December 31, 2017, 2016 and 2015, exclude potential shares for stock options, restricted shares, performance units, exchangeable notes, warrants outstanding and the Employee Stock Purchase Plan (“ESPP”) as we have net losses for those periods and their inclusion would be anti-dilutive. The following table discloses the number of anti-dilutive shares excluded:



	Year Ended December 31,
(Shares in millions)	2017	2016	2015
Anti-dilutive Potential Shares	250	104	3