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Earnings Per Share Computations
12 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Computations Earnings Per Share Computations
    The Company applies the two-class method when computing its earnings per share ("EPS"), which requires that net income per share for each class of share be calculated assuming all of the Company's net income is distributed as dividends to each class of share based on their contractual rights.

    Basic EPS is computed by dividing net income available to ordinary shareholders by the weighted-average number of ordinary shares outstanding after excluding the ordinary shares to be repurchased using forward contracts. Diluted EPS includes the effects of share options, restricted shares, performance rights, performance shares, and share rights, if dilutive.
 Years ended June 30,
(in millions, except per share amounts)202120202019
Numerator  
Net income attributable to Amcor plc$939 $612 $430 
Distributed and undistributed earnings attributable to shares to be repurchased(2)— (1)
Net income available to ordinary shareholders of Amcor plc—basic and diluted$937 $612 $429 
Net income available to ordinary shareholders of Amcor plc from continuing operations—basic and diluted$937 $620 $428 
Net income (loss) available to ordinary shareholders of Amcor plc from discontinued operations—basic and diluted$— $(8)$
Denominator
Weighted-average ordinary shares outstanding1,553 1,601 1,182 
Weighted-average ordinary shares to be repurchased by Amcor plc(2)(1)(2)
Weighted-average ordinary shares outstanding for EPS—basic1,551 1,600 1,180 
Effect of dilutive shares
Weighted-average ordinary shares outstanding for EPS—diluted1,556 1,602 1,184 
Per ordinary share income
Income from continuing operations$0.604 $0.387 $0.363 
Income from discontinued operations$— $(0.005)$0.001 
Basic earnings per ordinary share$0.604 $0.382 $0.364 
Income from continuing operations$0.602 $0.387 $0.362 
Income from discontinued operations$— $(0.005)$0.001 
Diluted earnings per ordinary share$0.602 $0.382 $0.363 

    Certain stock awards outstanding were not included in the computation of diluted earnings per share above because they would not have had a dilutive effect. The excluded stock awards represented an aggregate of 6 million, 37 million, and 6 million shares at June 30, 2021, 2020, and 2019, respectively.