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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 Thousands, $ in Millions
 3 Months Ended
Sep. 27, 2024
Sep. 29, 2023
Numerator:    
Net income (loss) $ 305 $ (184)
Number of shares used in per share calculations:    
Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc 211,000 208,000
Weighted-average effect of dilutive securities:    
Employee equity award plans 2,000 0
Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc 216,000 208,000
Net income per share attributable to Seagate Technology plc ordinary shareholders:    
Basic net income per share (in dollars per share) $ 1.45 $ (0.88)
Diluted net income per share (in dollars per share) $ 1.41 $ (0.88)
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 3,000 0
Potential common shares excluded from the computation of diluted net income (loss) per share (in shares)   6,000