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Unbilled Receivables (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 28, 2020
USD ($)
progress_payment
Mar. 29, 2020
USD ($)
progress_payment
Jun. 28, 2020
progress_payment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unbilled receivable       $ 36,657 $ 33,481
G&A costs in unbilled revenue       427 441
Combat Systems | International Customer Through Canadian Government          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unbilled receivable       $ 2,800 $ 2,900
Combat Systems | Large International Wheel Armored Vehicle Customer [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of progress payments received from customers | progress_payment 1 1 2    
Progress payments received in connection with outstanding receivables balance $ 500 $ 500