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Income Taxes (Unrecognized Tax Benefit Changes) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 0.20% | 45.10% |  | 17.00% | (31.50%) |
Effective Income Tax Rate Reconciliation, Change in U.K. Enacted Tax Rate, Amount |  |  |  | $ 73 |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  |  |  |  | $ 3,200 |
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount |  |  |  |  | 228 |
Effective Income Tax Rate Reconciliation, Deferred Tax Assets, Amount |  |  |  |  | 430 |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | $ 9 | $ 12 |  | 28 | $ 33 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 158 |  |  | 158 |  | $ 141
Effective Income Tax Reconciliation, Reorganization, Amount | 244 |  |  | 244 |  |
Forcepoint |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount |  |  |  | 148 |  |
Collins Aerospace military Global Positioning System (GPS) and space-based precision optics businesses |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount |  | $ 206 |  |  |  |
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 | 45 |  |  | 45 |  |
Minimum [Member] | Forecast [Member] |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  |  | $ 20 |  |  |
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 | $ 440 |  |  | $ 440 |  |
Maximum [Member] | Forecast [Member] |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  |  | $ 100 |  |  |

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the U.K. statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References No definition available. + Details
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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=121826272&loc=d3e32718-109319 + Details
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