v3.25.3

Debt (Narrative) (Details)			9 Months Ended
Debt (Narrative) (Details)	Feb. 20, 2025 USD ($)	Mar. 10, 2023 USD ($) extension	Oct. 03, 2025 USD ($)	Apr. 04, 2025 USD ($)	Jan. 03, 2025 USD ($)
Debt Instrument [Line Items]
Commercial paper outstanding			$ 0		$ 0
Commercial Paper
Debt Instrument [Line Items]
Commercial paper			1,000,000,000
Minimum denominations of commercial paper			$ 250,000
Debt instrument term (in days)			397 days
The Credit Agreement
Debt Instrument [Line Items]
Number of additional extensions \| extension		2
Debt instrument, extension term (in years)		1 year
Covenant, adjusted consolidated total debt to consolidated EBITDA ratio			3.75
Covenant, leverage ratio, maximum, potential increase following material acquisition			4.50
Covenant, consolidated EBITDA to interest expense ratio			3.50
$500 million notes, due March 2032 \| Unsecured debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500,000,000		$ 500,000,000
Debt interest rate (as percent)			5.40%
$500 million notes, due March 2032 \| Senior Notes
Debt Instrument [Line Items]
Debt interest rate (as percent)	5.40%
$500 million notes, due March 2035 \| Unsecured debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500,000,000		$ 500,000,000
Debt interest rate (as percent)			5.50%
$500 million notes, due March 2035 \| Senior Notes
Debt Instrument [Line Items]
Debt interest rate (as percent)	5.50%
Proceeds from the notes	$ 500,000,000
$500 million notes, due March 2035 \| Senior Notes \| Accelerated Share Repurchase
Debt Instrument [Line Items]
Repurchase of outstanding shares				$ 500,000,000
Notes Which Mature On March Two Thousand Thirty Three \| Unsecured debt
Debt Instrument [Line Items]
Amortization of debt discount and debt issuance costs	$ 10,000,000
Revolving credit facility \| The Credit Agreement \| Line of credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000,000,000
Commitment fee (in percentage)		0.125%
Long-term line of credit			$ 0		$ 0

Debt Instrument, Covenant, Adjusted Consolidated Total Debt To Consolidated EBITDA Ratio

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Debt Instrument, Covenant, Adjusted Consolidated Total Debt To Consolidated EBITDA Ratio Following Material Acquisition

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Debt Instrument, Covenant, Consolidated EBITDA To Interest Expense Ratio

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Debt Instrument, Maximum Borrowing Capacity

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Debt Instrument, Minimum Denominations Upon Issuance

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Debt Instrument, Number Of Options To Extend Term

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Debt Instrument, Term, Extension

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No definition available.

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- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Leidos Holdings, Inc. 10-Q