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Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) employee in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2024 USD ($) employee	Jun. 30, 2023 USD ($)	Jun. 28, 2024 USD ($) employee segment	Jun. 30, 2023 USD ($)	Dec. 29, 2023 USD ($)
Significant Accounting Policies [Line Items]
Number of employees in global workforce | employee	48		48
Number of reportable segments | segment			4
Revenue recognized for performance obligation satisfied in the previous periods	$ 16	$ 16	$ 21	$ 15
Accounts payable and accrued liabilities	2,235		2,235		$ 2,277
Restricted cash balances	118		118		151
Decrease In Income Before Income Taxes From Changes In Contract Estimates	54	$ 22	79	$ 38
UNITED KINGDOM
Significant Accounting Policies [Line Items]
Decrease In Income Before Income Taxes From Changes In Contract Estimates	(39)		(40)
Cash and Cash Equivalents
Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	$ 88		$ 88		$ 136
Leidos, Inc.
Significant Accounting Policies [Line Items]
Controlling ownership interest (as percent)	100.00%		100.00%

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