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Related Parties and Related Commitments and Contingencies - Related Party Debt (Details) - Related Party - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 27, 2024 | Jun. 28, 2024 | Sep. 27, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jul. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Oct. 27, 2021 | Aug. 20, 2021 | Jul. 31, 2021 | Dec. 20, 2019 | Oct. 03, 2019 | Jul. 25, 2019 | Mar. 29, 2019 | Dec. 19, 2018 | Nov. 25, 2014 | Apr. 29, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent | $ 0 | $ (102) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent | 553 | 814 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Notes due to Parent, net | 553 | 712 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent |  | (102) |  | $ (63) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent |  | 814 |  | 919 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Notes due to Parent, net |  | 712 |  | 856 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent | 0 | (102) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent |  | (102) |  | (63) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8 | $ 10 | $ 40 |  |
Notes due from Parent $40M - Dec. 19, 2018 | Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent |  | $ 0 |  | (40) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 4.55% |  |  |  | 0.33% |  |  | 0.15% |  |  |  |  |  |  |  |  |  |
Notes due from Parent $10M - Mar. 29, 2019 | Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent |  | $ 0 |  | (10) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 4.50% |  |  | 0.97% |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent $8M - Jul. 25, 2019 | Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent |  | $ 0 |  | (8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.37% |  |  |  |  | 0.12% |  |  |  |  | 0.18% |  |  |  |  |  |  |
2014 $500M Notes | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent |  | $ 475 |  | 467 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 $42B Yen Notes | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent |  | 262 |  | 291 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 $60M Yen Notes | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent |  | $ 0 |  | 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Notes receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, related parties |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101 |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.35% |  |  |  |  |
Revolving Credit Facility | Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, related parties |  |  |  |  |  |  |  |  |  | $ 100 |  |  | $ 1,000 | $ 101 |  |  |  |  |
Revolving Credit Facility | TIBOR | Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolving Credit Agreement due from Parent $101M - Oct. 3, 2019 | Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent |  | $ (102) |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolving Credit Agreement due from Parent $1B - Dec. 20, 2019 | Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent |  | 0 |  | (4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolving Credit Agreement due from Parent $100M October 27, 2021 | Notes receivable | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due from Parent |  | 0 |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolver Credit Agreement, 2021 | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent |  | $ 77 |  | 77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolver Credit Agreement, 2021 | LIBOR | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolver Credit Agreement 2019 | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent |  | $ 0 |  | 29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolver Credit Agreement 2019 One | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent |  | $ 0 |  | $ 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolver Credit Agreement, 2021 | LIBOR | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolver Credit Agreement 2019 | TIBOR | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolver Credit Agreement 2019 One | TIBOR | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Revolver Credit Agreement, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent | $ 553 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Revolver Credit Agreement, 2024 | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate | 1.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Revolver Credit Agreement, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent | $ 0 | 77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Revolver Credit Agreement, 2021 | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Revolver Credit Agreement, 2021 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Revolver Credit Agreement 2019 | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Revolver Credit Agreement 2019 One | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables | 2014 $500M Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent | $ 0 | 475 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |
Variable interest rate | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables | 2014 $500M Notes | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables | 2014 $42B Yen Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due to Parent | $ 0 | $ 262 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42
Notes Payable, Other Payables | 2014 $42B Yen Notes | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 42,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables | 2014 $42B Yen Notes | TIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables | 2014 $42B Yen Notes | TIBOR | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables | 2023 $60M Yen Notes | The Flash Business of Western Digital Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  | 6.698% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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