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Debt (Narrative) (Details) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended					30 Months Ended	37 Months Ended	42 Months Ended	61 Months Ended
	Sep. 17, 2019	Feb. 20, 2019	Apr. 02, 2021	Apr. 03, 2020	Apr. 02, 2021	Apr. 03, 2020	Jan. 15, 2029	Jan. 15, 2028	Jan. 15, 2027	Jan. 15, 2026	Jan. 15, 2025	Jul. 15, 2031	Jan. 15, 2024	Jul. 15, 2029	Jan. 15, 2026	Jan. 13, 2021	Dec. 08, 2020	Jun. 18, 2020	Jun. 10, 2020	Sep. 18, 2019	Feb. 03, 2017	May 14, 2015	Dec. 02, 2014	May 28, 2014	May 22, 2013
Debt Instrument [Line Items]
Repayments of Long-term Debt					$ 27,000,000	$ 685,000,000
Other Nonoperating Income (Expense) [Member] | Cost-method investments [Member]
Debt Instrument [Line Items]
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount			$ 10,000,000	$ 0	33,000,000	0
Senior note 3.125 percent due July 2029 [Member] | Forecast
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed										100.781%	101.563%		100.00%	100.00%
stx_DebtInstrumentAdditonalRedemptionPricePercentageOfPrincipalAmountRedeemed													1.00%
Debt Instrument, Basis Spread on Variable Rate													50.00%
Debt Instrument, Redemption Price With Cash Proceeds From Equity Offering, Percentage Of Principal AmountRedeemed													103.125%
Debt Instrument, Redemption With Cash Proceeds From Equity Offering, Percentage Of Principal Amount													40.00%
Senior Notes 3.375 Percent due July 2031 [Member] | Forecast
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed							100.563%	101.125%	101.688%			100.00%			100.00%
stx_DebtInstrumentAdditonalRedemptionPricePercentageOfPrincipalAmountRedeemed															1.00%
Debt Instrument, Basis Spread on Variable Rate													50.00%
Debt Instrument, Redemption Price With Cash Proceeds From Equity Offering, Percentage Of Principal AmountRedeemed													103.375%
Debt Instrument, Redemption With Cash Proceeds From Equity Offering, Percentage Of Principal Amount													40.00%
2019 Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity																$ 1,725,000,000
Line of credit facility, accordion feature, increase limit																275,000,000
Line of credit facility, percentage of most favored nation protection		0.50%
Amount of borrowings drawn					$ 0
Line of Credit Facility, Amount Less Than the Guarantee Requirement																$ 100,000,000
2019 Revolving Credit Facility | Line of Credit [Member]
Debt Instrument [Line Items]
Sub-limit for issuance of letters of credit under revolving credit facility		$ 75,000,000
2019 Revolving Credit Facility | Bridge Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, capacity available for specific purpose other than for trade purchases		50,000,000
Term Loan | Revolving Credit Facility
Debt Instrument [Line Items]
Redemption price					1.25%
Term Loan | Term Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		500,000,000
Amount of borrowings drawn	$ 500,000,000
Repayments of Long-term Debt			$ 6,000,000		$ 12,000,000
Senior Notes | Senior Notes 4.25 Percent Due March 2022 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																					$ 750,000,000
Stated interest rate (as a percent)																					4.25%
Debt Instrument, Repurchase Amount (3 Months)				23,000,000
Amount of debt repurchased																				$ 250,000,000
Gain (loss) on repurchase of debt instrument						10,000,000
Debt Instrument, Repurchase Amount (9 Months)					9,000,000	273,000,000
Senior Notes | Senior Notes 4.75 Percent Due June 2023 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																									$ 1,000,000,000
Stated interest rate (as a percent)																									4.75%
Debt Instrument, Repurchase Amount (3 Months)				$ 17,000,000
Amount of debt repurchased																				$ 200,000,000
Gain (loss) on repurchase of debt instrument					1,000,000	10,000,000
Debt Instrument, Repurchase Amount (9 Months)					$ 5,000,000	217,000,000
Senior Notes | Senior Notes 4.875 Percent Due March 2024 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																					$ 500,000,000
Stated interest rate (as a percent)																					4.875%
Senior Notes | Senior Notes 4.75 Percent Due January 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																								$ 1,000,000,000
Stated interest rate (as a percent)																								4.75%
Gain (loss) on repurchase of debt instrument						8,000,000
Debt Instrument, Repurchase Amount (9 Months)						$ 170,000,000
Senior Notes | Senior Notes 4.875 percent Due June 2027 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																						$ 700,000,000
Stated interest rate (as a percent)																						4.875%
Senior Notes | Senior note 5.75 percent due December 2034 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																							$ 500,000,000
Stated interest rate (as a percent)																							5.75%
Senior Notes | Senior note 4.091 percent due June 2029
Debt Instrument [Line Items]
Aggregate principal amount																		$ 500,000,000
Stated interest rate (as a percent)																		4.091%
Senior Notes | Senior note 5.75 percent due December 2034 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																			$ 500,000,000
Stated interest rate (as a percent)																			4.125%
Senior Notes | Senior note 3.125 percent due July 2029 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																	$ 500,000,000
Stated interest rate (as a percent)																	3.125%
Senior Notes | Senior Notes 3.375 Percent due July 2031 [Member]
Debt Instrument [Line Items]
Aggregate principal amount																	$ 500,000,000
Stated interest rate (as a percent)																	3.375%
Minimum | 2019 Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, accordion feature, increase limit		$ 25,000,000

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