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The discretionary amount of cash and cash equivalents contributed by the entity to fund its pension plans.

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Effective Income Tax Rate Reconciliation, Benefit Related to Discretionary Pension Contribution, Amount

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Effective Income Tax Rate Reconciliation, Completion of 2017 Tax Return and R&D Tax Credit Claims Related to 2014-2016 Tax Years, Amount

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Percentage of estimated foreign tax rate applicable to one-time transition liability

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The amount of state income tax, net, allocated to US Government contracts.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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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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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

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Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act.

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Amount of unrecognized tax benefits.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
Income Taxes (Narrative) (Details) - USD ($)	Sep. 30, 2018	Jul. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Deferred tax asset, Irish restructuring				$ 63,000,000
Valuation allowance			$ 360,000,000	84,000,000
Net tax benefit related to completion of 2017 tax return and additional amended R&D tax credit claims related to 2014-2016 tax year	$ 110,000,000
Discretionary pension contributions	$ 1,250,000,000		0	1,250,000,000	$ 1,000,000,000
Impact of Tax Cuts and Jobs Act of 2017 - tax benefit recorded related to deferred tax balance		$ 95,000,000
Unrecognized Tax Benefits			227,000,000	92,000,000	9,000,000	$ 7,000,000
Net State Income Tax Expense Allocated To Contracts			31,000,000	18,000,000	32,000,000
Operating Loss Carryforwards, Valuation Allowance			18,000,000
Valuation Allowance Recorded, Operating Loss Carryforwards			14,000,000
Tax Credit Carryforward, Amount			336,000,000
Tax Credit Carryforward, Valuation Allowance			241,000,000
Impact of Tax Cuts and Jobs Act of 2017 - tax expense (benefit) recorded				(1,000,000)	171,000,000
Tax Cuts and Jobs Act of 2017, Remeasurement of Deferred for Reduction in Corporate Tax Rate, Income Tax Expense (Benefit)					$ 100,000,000
Estimated Applicable Foreign Tax Rate					15.50%
Impact of Tax Cuts and Jobs Act of 2017 - tax expense (benefit) recorded related to foreign earnings				(1,000,000)	$ 71,000,000
U.K., France, Saudi Arabia and Guam [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards			87,000,000
Forcepoint \| Federal
Income Taxes [Line Items]
Operating Loss Carryforwards			106,000,000
Forcepoint \| Foreign
Income Taxes [Line Items]
Operating Loss Carryforwards			67,000,000
Forcepoint \| State
Income Taxes [Line Items]
Operating Loss Carryforwards			285,000,000
Valuation allowance for Irish restructuring transaction [Member]
Income Taxes [Line Items]
Valuation allowance				$ 63,000,000
Expiration through 2039 [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount			326,000,000
Indefinite expiration [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount			$ 10,000,000