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Balance Sheet Information (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Total Seagate Technology plc Shareholders' Equity, Starting Balance	$ 1,593
Total Seagate Technology plc Shareholders' Equity, Ending Balance	1,364	$ 1,593
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	(1)	1
Other comprehensive income (loss) before reclassifications	(3)	(4)
Amounts reclassified from AOCI	4	2
Other comprehensive income (loss)	1	(2)
Total Seagate Technology plc Shareholders' Equity, Ending Balance	0	(1)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	0	0
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	0	0
Other comprehensive income (loss)	0	0
Total Seagate Technology plc Shareholders' Equity, Ending Balance	0	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	(7)	(15)
Other comprehensive income (loss) before reclassifications	0	8
Amounts reclassified from AOCI	2	0
Other comprehensive income (loss)	2	8
Total Seagate Technology plc Shareholders' Equity, Ending Balance	(5)	(7)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	(17)	(16)
Other comprehensive income (loss) before reclassifications	5	(1)
Amounts reclassified from AOCI	0	0
Other comprehensive income (loss)	5	(1)
Total Seagate Technology plc Shareholders' Equity, Ending Balance	(12)	(17)
AOCI Attributable to Parent [Member]
Total Seagate Technology plc Shareholders' Equity, Starting Balance	(25)	(30)
Other comprehensive income (loss) before reclassifications	2	3
Amounts reclassified from AOCI	6	2
Other comprehensive income (loss)	8	5
Total Seagate Technology plc Shareholders' Equity, Ending Balance	$ (17)	$ (25)

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