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Earnings Per Share (Schedule of computation of basic and diluted net income (loss) per share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jul. 03, 2015
Numerator:      
Net income $ 772 $ 248 $ 1,742
Number of shares used in per share calculations:      
Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc 296 299 324
Weighted-average effect of dilutive securities:      
Employee equity award plans 3 3 7
Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc 299 302 331
Net income per share attributable to Seagate Technology plc ordinary shareholders:      
Basic net income per share (in dollars per share) $ 2.61 $ 0.83 $ 5.38
Diluted net income per share (in dollars per share) $ 2.58 $ 0.82 $ 5.26