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Amounts in Paragraphs - Debt (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sep. 02, 2021
Mar. 01, 2021
Debt Instrument [Line Items]          
Credit Facility, Covenant Terms, Maximum Debt to Capitalization Ratio The company also cannot permit the ratio of its debt to capitalization (as set forth in the credit agreement) to exceed 65 percent.        
Line of Credit Facility, Covenant Compliance the company was in compliance with all covenants under its credit agreement.        
Long-term Debt, Fair Value $ 15,100 $ 18,200      
Interest paid, net of interest received 570 $ 572 $ 521    
Debt Instruments [Abstract]          
2021 Note, Face Amount         $ 700
2021 Note, Interest Rate, Stated Percentage         3.50%
2022 Note, Face Amount         $ 1,500
2022 Note, Interest Rate, Stated Percentage         2.55%
Redemption Premium 54        
Principal Amount - NGSC Notes       $ 422  
Principal Amount - Northrop Grumman Corporation Notes       $ 422  
Five Year Term [Member] [Domain]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 2,000        
Credit facilities $ 0        
Two Thousand Thirty          
Debt Instruments [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 4.40%        
Two Thousand Fifty          
Debt Instruments [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 5.25%        
Commercial Paper [Member]          
Debt Instrument [Line Items]          
Commercial Paper, Maximum Borrowing Capacity $ 2,000        
Short-term Debt $ 0