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Summary of Significant Accounting Policies (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Jul. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Number of operating segments | Segment 4            
Number of defense segments | Segment 3            
Discontinued operations, net of tax $ 0 $ 0 $ 13,000,000        
Trading securities 0 0          
Other contract costs 499,000,000 652,000,000          
Cumulative Effect of New Accounting Principle in Period of Adoption             $ (366,000,000)
Notes              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Debt issued       $ 4,000,000,000   $ 7,500,000,000  
Information Technology And Mission Systems              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Impairment of reporting unit 0            
Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative Effect of New Accounting Principle in Period of Adoption             $ (65,000,000)
(ASU) 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative Effect of New Accounting Principle in Period of Adoption [1]         $ 37,000,000    
(ASU) 2016-13 | Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative Effect of New Accounting Principle in Period of Adoption [1]         $ 37,000,000    
Company-sponsored R & D, including product development costs              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Research and development expense $ 374,000,000 $ 466,000,000 502,000,000        
Discontinued Operations, Disposed of by Sale              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Discontinued operations, net of tax     $ 13,000,000        
[1] Reflects the cumulative effect of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which we adopted on January 1, 2020. See Note A for additional details.