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Goodwill and Other Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block] For the six months ended June 30, 2021, the carrying amounts of goodwill changed as follows:
($ in millions)IngallsNewport NewsTechnical SolutionsTotal
Balance as of December 31, 2020$175 $721 $721 $1,617 
Adjustments— — (13)(13)
Balance as of June 30, 2021$175 $721 $708 $1,604