v3.26.1
Balance Sheet Information (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 03, 2026
Jun. 27, 2025
Jun. 28, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Total Seagate Technology plc Shareholders' Equity, Starting Balance $ (453) $ (1,491)  
Gains reclassified into earnings 3 0  
Net unrealized (losses) gains arising during the period 5 (7)  
Losses (gains) reclassified into earnings 0 1  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 5 (6)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax   0  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 0 0  
Foreign currency translation adjustments 0 0  
Other comprehensive loss 8 (6) $ (100)
Total Seagate Technology plc Shareholders' Equity, Ending Balance 2,167 (453) (1,491)
Net unrealized (losses) gains arising during the period 3 0  
Gains reclassified into earnings 0 0  
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Total Seagate Technology plc Shareholders' Equity, Starting Balance (8) (2) 98
Other comprehensive loss before reclassifications 8 (7)  
Amounts reclassified from AOCI 0 1  
Other comprehensive loss 8 (6)  
Total Seagate Technology plc Shareholders' Equity, Ending Balance 0 (8) (2)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Total Seagate Technology plc Shareholders' Equity, Starting Balance 0 0  
Total Seagate Technology plc Shareholders' Equity, Ending Balance 3 0 0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Total Seagate Technology plc Shareholders' Equity, Starting Balance (8) (2)  
Total Seagate Technology plc Shareholders' Equity, Ending Balance (3) (8) (2)
Accumulated Foreign Currency Adjustment Attributable to Parent      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Total Seagate Technology plc Shareholders' Equity, Starting Balance 0 0  
Total Seagate Technology plc Shareholders' Equity, Ending Balance $ 0 $ 0 $ 0