v3.26.3
Fair Value (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) - USD ($)
$ in Millions
Oct. 02, 2026
Jul. 03, 2026
Debt Fair Value Disclosures    
Less: current portion of long-term debt, net of debt issuance costs $ 0 $ (185)
Long-term debt, less current portion, net of debt issuance costs $ 2,351 3,380
3.125% Senior Notes due July 2029    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 3.125%  
8.25% Senior Notes due December 2029    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 8.25%  
4.125% Senior Notes due January 2031    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 4.125%  
3.375% Senior Notes due July 2031    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 3.375%  
8.50% Senior Notes due July 2031    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 8.50%  
9.625% Senior Notes due December 2032    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 9.625%  
5.75% Senior Notes due December 2034    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 5.75%  
Convertible Senior note 3.50 percent due June 2028    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 3.50%  
Senior note 4.091 percent due June 2029    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 4.091%  
Senior Notes 5.875 Percent due July 2030    
Debt Fair Value Disclosures    
Stated interest rate (as a percent) 5.875%  
Carrying Amount    
Debt Fair Value Disclosures    
Long-Term Debt, Gross $ 2,372 3,591
Debt issuance costs (21) (26)
Debt, net of debt issuance costs 2,351 3,565
Less: current portion of long-term debt, net of debt issuance costs 0 (185)
Long-term debt, less current portion, net of debt issuance costs 2,351 3,380
Carrying Amount | 4.091% Senior Notes due June 2029 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 38 38
Carrying Amount | 4.091% Senior Notes due June 2029 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 312 332
Carrying Amount | 3.125% Senior Notes due July 2029 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 38 38
Carrying Amount | 3.125% Senior Notes due July 2029 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 98 98
Carrying Amount | 8.25% Senior Notes due December 2029 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 8
Carrying Amount | 8.25% Senior Notes due December 2029 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 492
Carrying Amount | 4.125% Senior Notes due January 2031 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 22 22
Carrying Amount | 4.125% Senior Notes due January 2031 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 164 177
Carrying Amount | 3.375% Senior Notes due July 2031 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 16 16
Carrying Amount | 3.375% Senior Notes due July 2031 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 45 45
Carrying Amount | 8.50% Senior Notes due July 2031 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 29
Carrying Amount | 8.50% Senior Notes due July 2031 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 471
Carrying Amount | 9.625% Senior Notes due December 2032 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 19 19
Carrying Amount | 9.625% Senior Notes due December 2032 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 731 731
Carrying Amount | 5.75% Senior Notes due December 2034 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 162 162
Carrying Amount | 5.75% Senior Notes due December 2034 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 327 327
Carrying Amount | Convertible Senior note 3.50 percent due June 2028    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 186
Carrying Amount | Senior Notes 5.875 Percent due July 2030 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 400 400
Estimate of Fair Value Measurement    
Debt Fair Value Disclosures    
Long-Term Debt, Gross 2,368 5,511
Debt issuance costs 0 0
Debt, net of debt issuance costs 2,368 5,511
Less: current portion of long-term debt, net of debt issuance costs 0 0
Long-term debt, less current portion, net of debt issuance costs 2,368 5,511
Estimate of Fair Value Measurement | 4.091% Senior Notes due June 2029 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 38 38
Estimate of Fair Value Measurement | 4.091% Senior Notes due June 2029 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 307 333
Estimate of Fair Value Measurement | 3.125% Senior Notes due July 2029 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 35 35
Estimate of Fair Value Measurement | 3.125% Senior Notes due July 2029 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 90 90
Estimate of Fair Value Measurement | 8.25% Senior Notes due December 2029 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 8
Estimate of Fair Value Measurement | 8.25% Senior Notes due December 2029 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 598
Estimate of Fair Value Measurement | 4.125% Senior Notes due January 2031 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 20 20
Estimate of Fair Value Measurement | 4.125% Senior Notes due January 2031 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 152 169
Estimate of Fair Value Measurement | 3.375% Senior Notes due July 2031 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 13 14
Estimate of Fair Value Measurement | 3.375% Senior Notes due July 2031 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 38 39
Estimate of Fair Value Measurement | 8.50% Senior Notes due July 2031 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 31
Estimate of Fair Value Measurement | 8.50% Senior Notes due July 2031 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 491
Estimate of Fair Value Measurement | 9.625% Senior Notes due December 2032 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 21 21
Estimate of Fair Value Measurement | 9.625% Senior Notes due December 2032 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 793 807
Estimate of Fair Value Measurement | 5.75% Senior Notes due December 2034 | Unsecured Senior Notes Issued By Seagate HDD Cayman    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 151 163
Estimate of Fair Value Measurement | 5.75% Senior Notes due December 2034 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 313 334
Estimate of Fair Value Measurement | Convertible Senior note 3.50 percent due June 2028    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings 0 1,913
Estimate of Fair Value Measurement | Senior Notes 5.875 Percent due July 2030 | Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd    
Debt Fair Value Disclosures    
Current and noncurrent debt including short-term borrowings $ 397 $ 407