v3.26.1
Debt - Long-term Debt (Details) - USD ($)
 12 Months Ended
Jul. 03, 2026
Jun. 27, 2025
Jun. 28, 2024
Jun. 30, 2026
May 31, 2026
May 27, 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]                          
Stated interest rate (as a percent)               8.50% 9.625%        
Current portion of long-term debt $ (185,000,000) $ 0                      
Long-term debt, less current portion 3,380,000,000 4,995,000,000                      
Net loss from debt transactions (151,000,000) (7,000,000) $ (29,000,000)                    
Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings 3,591,000,000 5,027,000,000                      
Long-Term Debt, Gross 3,591,000,000 5,027,000,000                      
Debt Issuance Costs, Net (26,000,000) (32,000,000)                      
Debt, net of debt issuance costs 3,565,000,000 4,995,000,000                      
Current portion of long-term debt (185,000,000) 0                      
Long-term debt, less current portion $ 3,380,000,000 4,995,000,000                      
4.091% Senior Notes due June 2029                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 4.091%                        
4.091% Senior Notes due June 2029 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 332,000,000 0                      
3.125% Senior Notes due July 2029                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 3.125%                        
3.125% Senior Notes due July 2029 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 38,000,000 138,000,000                      
9.625% Senior Notes due December 2032                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 4.125%                        
9.625% Senior Notes due December 2032 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 22,000,000 237,000,000                      
5.75% Senior Notes due December 2034                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 3.375%                        
5.75% Senior Notes due December 2034 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 16,000,000 61,000,000                      
9.625% Senior Notes due December 2032                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 5.75%                        
9.625% Senior Notes due December 2032 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 162,000,000 489,000,000                      
3.375% Senior Notes due July 2031                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 8.25%                        
3.375% Senior Notes due July 2031 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 8,000,000 500,000,000                      
3.375% Senior Notes due July 2031                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 8.50%                        
3.375% Senior Notes due July 2031 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 29,000,000 500,000,000                      
8.50% Senior Notes due July 2031                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 9.625%                        
8.50% Senior Notes due July 2031 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 19,000,000 750,000,000                      
Convertible Senior note 3.50 percent due June 2028 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Convertible Debt $ 186,000,000 1,500,000,000                      
3.125% Senior Notes due July 2029                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 5.875%                        
3.125% Senior Notes due July 2029 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 400,000,000 400,000,000                      
Senior note 4.091 percent due June 2029                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 4.091%                        
Senior note 4.091 percent due June 2029 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 38,000,000 452,000,000                      
Senior Notes 4.125 Percent Due January 2031 2 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings 177,000,000 0                      
Senior Notes 9.625 Percent due December 2032 2 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 731,000,000 0                      
Senior Notes 3.125 Percent due July 2029 2                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 3.125%                        
Senior Notes 3.125 Percent due July 2029 2 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 98,000,000 0                      
Senior Notes 8.25 Percent due December 2029 2                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 8.25%                        
Senior Notes 8.25 Percent due December 2029 2 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 492,000,000 0                      
Senior Notes | 4.091% Senior Notes due June 2029                          
Debt Instrument [Line Items]                          
Aggregate principal amount 89,000,000         $ 431,000,000         $ 500,000,000    
Stated interest rate (as a percent)           4.091%         4.091%    
Senior Notes | 3.125% Senior Notes due July 2029                          
Debt Instrument [Line Items]                          
Aggregate principal amount                   $ 500,000,000      
Stated interest rate (as a percent)                   3.125%      
Senior Notes | 9.625% Senior Notes due December 2032                          
Debt Instrument [Line Items]                          
Aggregate principal amount 1,000,000                     $ 500,000,000  
Stated interest rate (as a percent)                       4.125%  
Senior Notes | 5.75% Senior Notes due December 2034                          
Debt Instrument [Line Items]                          
Aggregate principal amount           $ 45,000,000       $ 500,000,000      
Stated interest rate (as a percent)           3.375%       3.375%      
Senior Notes | 9.625% Senior Notes due December 2032                          
Debt Instrument [Line Items]                          
Aggregate principal amount           $ 328,000,000             $ 500,000,000
Stated interest rate (as a percent)           5.75%             5.75%
Senior Notes | 3.375% Senior Notes due July 2031                          
Debt Instrument [Line Items]                          
Aggregate principal amount               $ 500,000,000          
Stated interest rate (as a percent)               8.25%          
Senior Notes | 3.375% Senior Notes due July 2031                          
Debt Instrument [Line Items]                          
Aggregate principal amount           $ 471,000,000   $ 500,000,000          
Stated interest rate (as a percent)           8.50%   8.50%          
Senior Notes | 8.50% Senior Notes due July 2031                          
Debt Instrument [Line Items]                          
Aggregate principal amount                 $ 750,000,000        
Senior Notes | 3.125% Senior Notes due July 2029                          
Debt Instrument [Line Items]                          
Aggregate principal amount           $ 400,000,000              
Stated interest rate (as a percent)           5.875%              
Senior Notes | Senior Notes 4.125 Percent Due January 2031 2                          
Debt Instrument [Line Items]                          
Aggregate principal amount 36,000,000         $ 213,000,000              
Stated interest rate (as a percent)           4.125%              
Senior Notes | Senior Notes 9.625 Percent due December 2032 2                          
Debt Instrument [Line Items]                          
Aggregate principal amount           $ 731,000,000              
Stated interest rate (as a percent)           9.625%              
Senior Notes | Senior Notes 3.125 Percent due July 2029 2                          
Debt Instrument [Line Items]                          
Aggregate principal amount 2,000,000         $ 100,000,000              
Stated interest rate (as a percent)           3.125%              
Senior Notes | Senior Notes 8.25 Percent due December 2029 2                          
Debt Instrument [Line Items]                          
Aggregate principal amount           $ 492,000,000              
Stated interest rate (as a percent)           8.25%              
Convertible Debt | Convertible Senior note 3.50 percent due June 2028                          
Debt Instrument [Line Items]                          
Aggregate principal amount       $ 35,000,000 $ 28,000,000   $ 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 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings 38,000,000 452,000,000                      
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 38,000,000 138,000,000                      
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   237,000,000                      
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   61,000,000                      
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   489,000,000                      
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 8,000,000 500,000,000                      
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   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   750,000,000                      
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   0                      
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 45,000,000 0                      
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 327,000,000 0                      
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 471,000,000 0                      
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   400,000,000                      
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | Senior Notes 4.125 Percent Due January 2031 2 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings   0                      
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | Senior Notes 9.625 Percent due December 2032 2 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings $ 731,000,000 0                      
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | Senior Notes 3.125 Percent due July 2029 2 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings   0                      
Unsecured Senior Notes Issued By Seagate Data Storage Technology Pte. Ltd | Senior Notes 8.25 Percent due December 2029 2 | Reported Value Measurement                          
Debt Instrument [Line Items]                          
Current and noncurrent debt including short-term borrowings   $ 0