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Supplemental Financial Statement Data - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 27, 2024 | Sep. 27, 2024 | Dec. 29, 2023 | Sep. 29, 2023 | Dec. 27, 2024 | Dec. 29, 2023 | Jun. 28, 2024 | Jun. 30, 2023 | Jul. 01, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | $ 12,126 | $ 11,082 | $ 10,925 | $ 11,439 | $ 11,082 | $ 11,439 | $ 11,439 |  |
Income tax expense related to items of other comprehensive income (loss) |  |  |  |  | (15) | (5) |  |  |
Net current-period other comprehensive income (loss) |  |  |  |  | 24 | 28 |  |  |
Net transfer from Parent | (92) | 583 | 152 | 19 |  |  | 275 | $ 376 | $ (922)
Ending balance | 12,001 | 12,126 | 10,896 | 10,925 | 12,001 | 10,896 | 11,082 | 11,439 |
The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  | 11,082 |  | 11,439 | 11,082 | 11,439 | 11,439 | 12,977 | 12,981
Income tax expense related to items of other comprehensive income (loss) |  |  |  |  |  |  | 21 | (29) | 35
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | (109) | 64 | (317)
Net transfer from Parent |  |  |  |  |  |  | 275 | 376 | (922)
Ending balance |  |  |  |  |  |  | 11,082 | 11,439 | 12,977
Total Accumulated Comprehensive Loss |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | (243) | 452 | (398) | (343) | 452 | (343) | (343) |  |
Net transfer from Parent | (6) | 0 | 0 | 0 | (6) |  |  |  |
Ending balance | (434) | (243) | $ (315) | (398) | (434) | (315) | 452 | (343) |
Total Accumulated Comprehensive Loss | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  | (452) |  | (343) | (452) | (343) | (343) | (407) | (90)
Net transfer from Parent |  |  |  |  |  |  | 0 | 0 | 0
Ending balance |  |  |  |  |  |  | (452) | (343) | (407)
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  | (208) |  |  | (208) |  |  |  |
Other comprehensive income (loss) |  |  |  |  | (35) |  |  |  |
Income tax expense related to items of other comprehensive income (loss) |  |  |  |  | 0 |  |  |  |
Net current-period other comprehensive income (loss) |  |  |  |  | (35) |  |  |  |
Net transfer from Parent |  |  |  |  | 0 |  |  |  |
Ending balance | (243) |  |  |  | (243) |  | (208) |  |
Foreign Currency Translation Adjustment | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  | (208) |  | (165) | (208) | (165) | (165) | (130) |
Other comprehensive income (loss) |  |  |  |  |  |  | (43) | (35) |
Income tax expense related to items of other comprehensive income (loss) |  |  |  |  |  |  | 0 | 0 |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | (43) | (35) |
Ending balance |  |  |  |  |  |  | (208) | (165) | (130)
Unrealized Gain (Loss) on Derivative Contracts |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  | (244) |  |  | (244) |  |  |  |
Other comprehensive income (loss) |  |  |  |  | 74 |  |  |  |
Income tax expense related to items of other comprehensive income (loss) |  |  |  |  | (15) |  |  |  |
Net current-period other comprehensive income (loss) |  |  |  |  | 59 |  |  |  |
Net transfer from Parent |  |  |  |  | (6) |  |  |  |
Ending balance | $ (191) |  |  |  | (191) |  | (244) |  |
Unrealized Gain (Loss) on Derivative Contracts | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  | (244) |  | (178) | (244) | (178) | (178) | (277) |
Other comprehensive income (loss) |  |  |  |  |  |  | (87) | 128 |
Income tax expense related to items of other comprehensive income (loss) |  |  |  |  |  |  | 21 | (29) |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | (66) | 99 |
Ending balance |  |  |  |  |  |  | (244) | (178) | (277)
Accumulated Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  | (452) |  |  | (452) |  |  |  |
Other comprehensive income (loss) |  |  |  |  | 39 |  |  |  |
Income tax expense related to items of other comprehensive income (loss) |  |  |  |  | (15) |  |  |  |
Net current-period other comprehensive income (loss) |  |  |  |  | 24 |  |  |  |
Ending balance |  |  |  |  |  |  | (452) |  |
Accumulated Comprehensive Income (Loss) [Member] | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance |  | $ (452) |  | $ (343) | $ (452) | $ (343) | (343) | (407) |
Other comprehensive income (loss) |  |  |  |  |  |  | (130) | 93 |
Income tax expense related to items of other comprehensive income (loss) |  |  |  |  |  |  | 21 | (29) |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | (109) | 64 |
Ending balance |  |  |  |  |  |  | $ (452) | $ (343) | $ (407)

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