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 and potentially dilutive shares. The following table presents our basic and diluted weighted average shares outstanding for the first quarter of 2018 and 2017:



	Three Months Ended March 31,
(Shares in millions)	2018	2017
Basic and Diluted weighted average shares outstanding	994	988

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 first quarter of 2018 and 2017 exclude potential shares for stock options, restricted shares, performance 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 discloses the number of anti-dilutive shares excluded for the first quarter of 2018 and 2017:



	Three Months Ended March 31,
(Shares in millions)	2018	2017
Anti-dilutive potential shares due to net loss	250	250