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Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) employee in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 03, 2025 USD ($) employee | Sep. 27, 2024 USD ($) | Oct. 03, 2025 USD ($) employee | Sep. 27, 2024 USD ($) | Jan. 03, 2025 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of employees in global workforce | employee | 47 |  | 47 |  |
Revenue recognized for performance obligation satisfied in the previous periods | $ 18 | $ 78 | $ 32 | $ 12 |
Cash and cash equivalents | 974 | $ 1,097 | 974 | 1,097 | $ 849
Accounts payable and accrued liabilities | 2,158 |  | 2,158 |  | 2,131
Increase in cash flows |  |  |  | $ 48 |
Restricted cash balances | $ 123 |  | $ 123 |  | 141
Adjustment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 94
Accounts payable and accrued liabilities |  |  |  |  | $ 94
Leidos, Inc. |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Controlling ownership interest (as percent) | 100.00% |  | 100.00% |  |

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