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 share units. The following table presents our basic and diluted weighted average shares outstanding for the second quarter and the first six months of 2017 and 2016:



	Three Months Ended June 30,		Six Months Ended June 30,
(Shares in millions)	2017	2016	2017	2016
Basic and Diluted weighted average shares outstanding	990	899	989	856

Our basic and diluted weighted average shares outstanding for the periods presented are equivalent due to the net loss attributable to shareholders. Diluted weighted average shares outstanding for the second quarter and the first six months of 2017 and 2016 exclude potential shares for stock options, restricted shares, performance share units, exchangeable notes, warrant outstanding and the Employee Stock Purchase Plan as we have net losses for those periods, and their inclusion would be anti-dilutive. The following table presents the number of anti-dilutive shares excluded for the second quarter and the first six months of 2017 and 2016:



	Three Months Ended June 30,		Six Months Ended June 30,
(Shares in millions)	2017	2016	2017	2016
Anti-dilutive potential shares due to net loss	250	43	250	24