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Transaction [Table] Related Party Transaction [Table] Other current assets Other Assets, Current Acquired intangible assets Acquired Intangible Assets [Member] Acquired Intangible Assets Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating earnings Total operating earnings Operating Income (Loss) Total backlog Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Cash dividend Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividend per share (in usd per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Land, buildings and improvements Land, Buildings and Improvements [Member] Transfer of Financial Assets Accounted for as Sales [Roll Forward] Transfer Of Financial Assets Accounted For As Sales [Roll Forward] Transfer Of Financial Assets Accounted For As Sales Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Sale of receivable, aggregate capacity Transfers Of Financial Assets Accounted For As Sale, Securitization Facility Availability Transfers Of Financial Assets Accounted For As Sale, Securitization Facility Availability Equity Components [Axis] Equity Components [Axis] Accounts 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Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Leonardo S.p.A. Leonardo S.p.A. [Member] Leonardo S.p.A. Financial Institution Credit Facilities Financial Institution Credit Facilities [Member] Financial Institution Credit Facilities Subcontractor Sales Channel, Through Intermediary [Member] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Raw materials Inventory, Raw Materials, Net of Reserves Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Schedule of Revenues, Expenses, and Operating Earnings by Segment and Reconciliation to Earnings before Taxes Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Warranty reserves Product Warranty Accrual, Noncurrent Entity Address, Address Line Two Entity Address, Address Line Two Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax provision Income Tax Expense (Benefit) Customer Concentration Risk Customer Concentration Risk [Member] Award Timing Method Award Timing Method [Text Block] Net decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Sale of Receivables Transfers and Servicing of Financial Assets [Text Block] Flexibly Priced Time-and-Materials Contract [Member] Net earnings Net earnings Net earnings Net earnings Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Restatement Determination Date: Restatement Determination Date [Axis] Salaries, wages and accrued bonuses Salaries, Wages And Accrued Bonuses, Current Salaries, Wages And Accrued Bonuses, Current Schedule of Contract Assets and Contract Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Long-Term Contracts on Electric Power and Propulsion Programs Long-Term Contracts On Electric Power And Propulsion Programs [Member] Long-Term Contracts On Electric Power And Propulsion Programs International and Commercial Customers International And Commercial Customers [Member] International And Commercial Customers Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]