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Accumulated Other Comprehensive Income (Loss) - Narrative (Details) $ in Millions	Feb. 11, 2026 USD ($)
Equity [Abstract]
Settlement loss recorded in other expense, net	$ 23

X

- Definition

Settlement Loss

+ References

No definition available.

+ Details

Name:	ldos_SettlementLoss
Namespace Prefix:	ldos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration