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Summary of Significant Accounting Policies (Narrative) (Details)
12 Months Ended 36 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
business
Dec. 31, 2019
USD ($)
business
Dec. 31, 2021
USD ($)
business
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Trading securities | $ $ 0 $ 0   $ 0
Other contract costs | $ 305,000,000 $ 499,000,000   $ 305,000,000
Aerospace | Discontinued Operations, Disposed of by Sale        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of businesses sold   1    
Technologies | Discontinued Operations, Disposed of by Sale        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of businesses sold   2 1  
Technologies | Disposal Group, Held-for-sale, Not Discontinued Operations        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of businesses sold   1 1  
Series of Individually Immaterial Business Acquisitions | Aerospace        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of businesses acquired       6
Series of Individually Immaterial Business Acquisitions | Combat Systems        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of businesses acquired       2
Series of Individually Immaterial Business Acquisitions | Technologies        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of businesses acquired       1
Company-sponsored R & D, including product development costs        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Research and development expense | $ $ 415,000,000 $ 374,000,000 $ 466,000,000