v3.26.3
Debt - Long-term Debt (Details) - USD ($)
Oct. 02, 2026
Jul. 03, 2026
Jun. 30, 2025
Sep. 13, 2023
May 30, 2023
Nov. 30, 2022
Dec. 08, 2020
Jun. 18, 2020
Jun. 10, 2020
Dec. 02, 2014
Debt Instrument [Line Items]                    
Current portion of long-term debt $ 0 $ (185,000,000)                
Long-term debt, less current portion 2,351,000,000 3,380,000,000                
Reported Value Measurement                    
Debt Instrument [Line Items]                    
Long-Term Debt, Gross 2,372,000,000 3,591,000,000                
Debt Issuance Costs, Net (21,000,000) (26,000,000)                
Debt, net of debt issuance costs 2,351,000,000 3,565,000,000                
Current portion of long-term debt 0 (185,000,000)                
Long-term debt, less current portion $ 2,351,000,000 3,380,000,000                
3.125% Senior Notes due July 2029                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 3.125%                  
8.25% Senior Notes due December 2029                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 8.25%                  
4.125% Senior Notes due January 2031                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 4.125%                  
3.375% Senior Notes due July 2031                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 3.375%                  
8.50% Senior Notes due July 2031                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 8.50%                  
9.625% Senior Notes due December 2032                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 9.625%                  
5.75% Senior Notes due December 2034                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 5.75%                  
Senior Notes 5.875 Percent due July 2030                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 5.875%                  
Convertible Senior note 3.50 percent due June 2028                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 3.50%                  
Convertible Senior note 3.50 percent due June 2028 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings $ 0 186,000,000                
Convertible Debt 0 186,000,000                
Senior Notes | 4.091% Senior Notes due June 2029                    
Debt Instrument [Line Items]                    
Aggregate principal amount 21,000,000                  
Stated interest rate (as a percent)               4.091%    
Senior Notes | 3.125% Senior Notes due July 2029                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)             3.125%      
Senior Notes | 8.25% Senior Notes due December 2029                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)         8.25%          
Senior Notes | 4.125% Senior Notes due January 2031                    
Debt Instrument [Line Items]                    
Aggregate principal amount $ 13,000,000                  
Stated interest rate (as a percent)                 4.125%  
Senior Notes | 3.375% Senior Notes due July 2031                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)             3.375%      
Senior Notes | 8.50% Senior Notes due July 2031                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)         8.50%          
Senior Notes | 9.625% Senior Notes due December 2032                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)         9.625%          
Senior Notes | 5.75% Senior Notes due December 2034                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent)                   5.75%
Senior Notes | Senior Notes 5.875 Percent due July 2030                    
Debt Instrument [Line Items]                    
Stated interest rate (as a percent) 5.875%                  
Convertible Debt | Convertible Senior note 3.50 percent due June 2028                    
Debt Instrument [Line Items]                    
Aggregate principal amount       $ 1,500,000,000            
Stated interest rate (as a percent)       3.50%            
Unsecured Senior Notes Issued By Seagate HDD Cayman | 4.091% Senior Notes due June 2029                    
Debt Instrument [Line Items]                    
Aggregate principal amount               $ 500,000,000    
Unsecured Senior Notes Issued By Seagate HDD Cayman | 4.091% Senior Notes due June 2029 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings $ 38,000,000 38,000,000                
Unsecured Senior Notes Issued By Seagate HDD Cayman | 3.125% Senior Notes due July 2029                    
Debt Instrument [Line Items]                    
Aggregate principal amount             $ 500,000,000      
Unsecured Senior Notes Issued By Seagate HDD Cayman | 3.125% Senior Notes due July 2029 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 38,000,000 38,000,000                
Unsecured Senior Notes Issued By Seagate HDD Cayman | 8.25% Senior Notes due December 2029                    
Debt Instrument [Line Items]                    
Aggregate principal amount         $ 500,000,000          
Unsecured Senior Notes Issued By Seagate HDD Cayman | 8.25% Senior Notes due December 2029 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 0 8,000,000                
Unsecured Senior Notes Issued By Seagate HDD Cayman | 4.125% Senior Notes due January 2031                    
Debt Instrument [Line Items]                    
Aggregate principal amount                 $ 500,000,000  
Unsecured Senior Notes Issued By Seagate HDD Cayman | 4.125% Senior Notes due January 2031 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 22,000,000 22,000,000                
Unsecured Senior Notes Issued By Seagate HDD Cayman | 3.375% Senior Notes due July 2031                    
Debt Instrument [Line Items]                    
Aggregate principal amount             $ 500,000,000      
Unsecured Senior Notes Issued By Seagate HDD Cayman | 3.375% Senior Notes due July 2031 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 16,000,000 16,000,000                
Unsecured Senior Notes Issued By Seagate HDD Cayman | 8.50% Senior Notes due July 2031                    
Debt Instrument [Line Items]                    
Aggregate principal amount         $ 500,000,000          
Unsecured Senior Notes Issued By Seagate HDD Cayman | 8.50% Senior Notes due July 2031 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 0 29,000,000                
Unsecured Senior Notes Issued By Seagate HDD Cayman | 9.625% Senior Notes due December 2032                    
Debt Instrument [Line Items]                    
Aggregate principal amount           $ 750,000,000        
Unsecured Senior Notes Issued By Seagate HDD Cayman | 9.625% Senior Notes due December 2032 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 19,000,000 19,000,000                
Unsecured Senior Notes Issued By Seagate HDD Cayman | 5.75% Senior Notes due December 2034                    
Debt Instrument [Line Items]                    
Aggregate principal amount                   $ 500,000,000
Unsecured Senior Notes Issued By Seagate HDD Cayman | 5.75% Senior Notes due December 2034 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 162,000,000 162,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 4.091% Senior Notes due June 2029                    
Debt Instrument [Line Items]                    
Aggregate principal amount     $ 431,000,000              
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 4.091% Senior Notes due June 2029 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 312,000,000 332,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 3.125% Senior Notes due July 2029                    
Debt Instrument [Line Items]                    
Aggregate principal amount     100,000,000              
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 3.125% Senior Notes due July 2029 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 98,000,000 98,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 8.25% Senior Notes due December 2029                    
Debt Instrument [Line Items]                    
Aggregate principal amount     492,000,000              
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 8.25% Senior Notes due December 2029 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 0 492,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 4.125% Senior Notes due January 2031                    
Debt Instrument [Line Items]                    
Aggregate principal amount     213,000,000              
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 4.125% Senior Notes due January 2031 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 164,000,000 177,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 3.375% Senior Notes due July 2031                    
Debt Instrument [Line Items]                    
Aggregate principal amount     45,000,000              
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 3.375% Senior Notes due July 2031 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 45,000,000 45,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 8.50% Senior Notes due July 2031                    
Debt Instrument [Line Items]                    
Aggregate principal amount     471,000,000              
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 8.50% Senior Notes due July 2031 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 0 471,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 9.625% Senior Notes due December 2032                    
Debt Instrument [Line Items]                    
Aggregate principal amount     731,000,000              
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 9.625% Senior Notes due December 2032 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 731,000,000 731,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 5.75% Senior Notes due December 2034                    
Debt Instrument [Line Items]                    
Aggregate principal amount     $ 328,000,000              
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | 5.75% Senior Notes due December 2034 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings 327,000,000 327,000,000                
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | Senior Notes 5.875 Percent due July 2030                    
Debt Instrument [Line Items]                    
Aggregate principal amount 400,000,000                  
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | Senior Notes 5.875 Percent due July 2030 | Reported Value Measurement                    
Debt Instrument [Line Items]                    
Current and noncurrent debt including short-term borrowings $ 400,000,000 $ 400,000,000