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Income Taxes (Unrecognized Tax Benefit Changes) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2021
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Percent | 29.80% | 56.50% |
Effective Income Tax Rate Reconciliation, Deferred Tax Assets, Amount |  | $ 415 |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | $ 143 | $ 97 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 9 |  |
Forcepoint |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount | 148 |  |
Minimum [Member] |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change | 50 |  |
Minimum [Member] | Forecast [Member] |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  |  | $ 50
Maximum [Member] |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change | $ 140 |  |
Maximum [Member] | Forecast [Member] |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  |  | $ 100

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the disposition of a business not qualifying as a discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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