Balance Sheet Information (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 28, 2024	Jun. 30, 2023	Jul. 01, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	$ (1,199)	$ 109	$ 631
(Gains) losses reclassified into earnings	(103)	52
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	2	10
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	1	0	0
Other comprehensive income	(100)	62	77
Total Seagate Technology plc Shareholders' Equity, Ending Balance	(1,491)	(1,199)	109
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	98	36	(41)
Other comprehensive income before reclassifications	(11)	76
Amounts reclassified from AOCI	(89)	(14)
Other comprehensive income	(100)	62
Total Seagate Technology plc Shareholders' Equity, Ending Balance	(2)	98	36
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	103	51
Total Seagate Technology plc Shareholders' Equity, Ending Balance	0	103	51
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	(4)	(14)
Net unrealized gains arising during the period	1	11	6
Losses (gains) reclassified into earnings	1	(1)	2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	2	10	8
Total Seagate Technology plc Shareholders' Equity, Ending Balance	(2)	(4)	(14)
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	(1)	(1)
Total Seagate Technology plc Shareholders' Equity, Ending Balance	$ 0	$ (1)	$ (1)