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Segment Assets (Table) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Segment Reporting Information    
Assets $ 8,445 $ 7,031
Ingalls    
Segment Reporting Information    
Assets 1,679 1,618
Newport News    
Segment Reporting Information    
Assets 4,178 3,886
Technical Solutions    
Segment Reporting Information    
Assets 1,384 1,022
Corporate    
Segment Reporting Information    
Assets $ 1,204 $ 505